Exact Chemical Formulae
Ag (in 3 terms)Ag -- pHAg -- solute-volatilization interferenceAg+ -- interfering substanceAg2S (in 1 term)Ag2S -- crystalline electrodesAgBr (in 1 term)AgBr -- molecular rearrangementAgCl (in 2 terms)AgCl -- pHAgCl -- gravimetric methodAgI (in 2 terms)α-AgI -- polymorphic transitionAgI -- crystalline electrodesAgNO3 (in 1 term)AgNO3 -- gravimetric methodAl (in 1 term)Al -- solute-volatilization interferenceAl2 (in 1 term)2Al3+ -- mean activity of an electrolyte in solutionAl2MgO4 (in 1 term)MgAl2O4 -- solute-volatilization interferenceAlCl3 (in 1 term)AlCl3 -- ionizationAlNb3 (in 1 term)Nb3Al -- superconducting transitionAr (in 6 terms)Ar+ -- diamond by CVDAr -- gas-filled phototubeAr -- excimer lampAr+ -- diamond-like carbon filmsAr -- cryogenic samplingAr -- Penning gas mixtureAr2 (in 1 term)Ar2 -- excimer lampArHOSe (in 1 term)ArSeOH -- selenenic acidsAs (in 2 terms)As -- photoconductive detectorAs -- poison in catalysisAs3H11 (in 1 term)H4AsAsH3AsH4 -- arsanesAs3H5 (in 1 term)H2AsAsHAsH2 -- arsanesAsF5 (in 1 term)AsF5 -- dopantAsH2 (in 1 term)H2As+ -- arsanylium ionsAsH2O (in 1 term)H2As(=O)+ -- arsanylium ionsAsH2O2 (in 1 term)HAs(OH)2 -- arsonous acidsAsH3 (in 2 terms)AsH3 -- arsinesAsH3 -- arsanesAsH3O (in 2 terms)H2AsOH -- arsinous acidsH3As=O -- arsine oxidesAsH3O2 (in 1 term)AsH3O2 -- arsinic acidsAsH3O3 (in 1 term)AsH3O3 -- arsonic acidsAsH4 (in 1 term)(H4As+) -- onium compoundsAsH5 (in 1 term)AsH5 -- arsoranesAu (in 2 terms)Au -- disproportionation197Au -- nuclear quadrupole moment (spectroscopic)AuFe (in 1 term)Au–Fe -- spin-glass transitionB (in 1 term)B -- organically modified silicaB2BaO4 (in 1 term)BaB2O4 -- optical parametric oscillatorB2H (in 1 term)B–H–B -- electron-deficient bondB2H6 (in 1 term)B2H6 -- electron-deficient bondB5H9 (in 1 term)B5H9 -- boranesBa (in 1 term)Ba2+ -- mean activity of an electrolyte in solutionBaO3Ti (in 1 term)BaTiO3 -- ferroelectric (antiferroelectric) transitionBH (in 2 terms)HB+ -- heteroconjugationHB: -- carbene analoguesBH6N (in 1 term)H3N
BH3 -- dative bond BiH3 (in 2 terms)BiH3 -- bismuthinesBiH3 -- bismuthanesBiH4 (in 1 term)(H4Bi+) -- onium compoundsBN (in 1 term)NB -- dative bond Br (in 9 terms)Br -- excimer lampBr -- sulfonium compoundsBr -- addition reactionBr -- telomerizationBr -- fragmentationBr -- molecular rearrangementBr -- allylic substitution reactionBr− -- leaving groupBr+ -- halonium ionsBrH (in 1 term)BrH -- leaving groupBrH2 (in 1 term)(H2Br+) -- onium compoundsBrKr (in 1 term)KrBr -- excimer lampBrXe (in 1 term)XeBr -- excimer lampC (in 15 terms)C -- multiply labelledC -- transferasesC -- strain energy–C= -- heteroarenesC -- organically modified silica13C -- chemical shiftC -- potential-energy (reaction) surfaceC -- tautomerismC -- dipolar compoundsC -- methylotrophic microorganismsC -- hydrogen bond in theoretical organic chemistryC -- repulsive potential-energy surface12C -- relative micellar mass12C -- molecular ion in mass spectrometryC -- spin polarizationC10 (in 2 terms)C10 -- monoterpenoidsC10 -- terpenesC10H10 (in 2 terms)C10H10 -- non-Kekulé moleculesC10H10 -- polyquinanes (polyquinenes)C10H14NO (in 1 term)C10H14NO -- amidium ionsC10H15NS (in 1 term)(C2H5)2S=NPh -- sulfimidesC10H16 (in 2 terms)C10H16 -- electrocyclic reactionC10H16 -- ring assemblyC10H18 (in 1 term)C10H18 -- cis-trans isomersC10H20 (in 1 term)C10H20 -- iridoidsC10H6 (in 1 term)C10H6 -- dehydroarenesC10H8 (in 2 terms)C10H8 -- fulvalenesC10H8 -- alternantC10H8O (in 1 term)C10H8O -- phenolsC11H12O4 (in 1 term)C11H12O4 -- acylalsC11H14 (in 2 terms)C11H14 -- hula-twist (HT) mechanismC11H14 -- bicycle-pedal (BP) mechanismC11H6O3 (in 1 term)C11H6O3 -- furocoumarinsC12H10 (in 1 term)C12H10 -- ring assemblyC12H10N2 (in 1 term)PhN=NPh -- azo compoundsC12H10N2O (in 1 term)C12H10N2O -- azoxy compoundsC12H10O5S2 (in 1 term)PhS(=O)2OS(=O)2Ph -- sulfonic anhydridesC12H10OS (in 1 term)Ph2S=O -- sulfoxidesC12H12N2S (in 1 term)Ph2S(=NH)2 -- sulfonediiminesC12H14 (in 1 term)C12H14 -- antiC12H24O6 (in 1 term)C12H24O6 -- crownC12H8 (in 1 term)C12H8 -- ring assemblyC12H8Cl2 (in 1 term)C12H8Cl2 -- meso-compoundC12O9 (in 1 term)C12O9 -- oxocarbonsC13H10O (in 1 term)Ph2C–O.− -- radical ionC13H12O2 (in 1 term)C13H12O2 -- bisphenolsC13H13N3 (in 1 term)PhN=N–NPhMe -- diazoamino compoundsC13H13OP (in 1 term)(Ph)2POCH3 -- estersC13H14 (in 1 term)C13H14 -- spiro compoundsC13H14O4 (in 1 term)C13H14O4 -- cycloadditionC13H16O7 (in 1 term)C13H16O7 -- glycosidesC14H10 (in 2 terms)C14H10 -- quinarenesC14H10 -- acenesC14H10O (in 1 term)C14H10O -- epoxy compoundsC14H10O9 (in 1 term)C14H10O9 -- depsidesC14H10OS2 (in 1 term)C14H10OS2 -- acid anhydridesC14H12 (in 1 term)C14H12 -- cycloadditionC14H12N6O3 (in 1 term)C14H12N6O3 -- folatesC14H24 (in 1 term)C14H24 -- propellanesC15 (in 2 terms)C15 -- sesquiterpenoidsC15 -- terpenesC15H10O2 (in 1 term)C15H10O2 -- flavonoids (isoflavonoids and neoflavonoids)C15H11O (in 1 term)C15H11O -- anthocyanidinsC15H16N (in 1 term)(p-Me2NC6H4)2CHPh -- leuco basesC16H10 (in 1 term)C16H10 -- ortho- and peri-fused (polycyclic compounds)C16H14O (in 1 term)PhC(=O)CH=C(CH3)Ph -- dypnonesC16H16 (in 1 term)C16H16 -- cyclophanesC17H16Cl3 (in 1 term)C17H16Cl3 -- chain transferC17H21N2 (in 1 term)C17H21N2 -- cyanine dyesC17H21NO4 (in 1 term)C17H21NO4 -- pseudo-asymmetric carbon atomC17H28 (in 1 term)C17H28 -- steroidsC18H12 (in 1 term)C18H12 -- ortho-fused (polycyclic compounds)C18H14 (in 1 term)C18H14 -- quinarenesC18H34O9 (in 1 term)C18H34O9 -- in-out isomerismC18H36N2O6 (in 1 term)C18H36N2O6 -- cryptandC19H12 (in 1 term)C19H12 -- ortho- and peri-fused (polycyclic compounds)C19H14N4 (in 1 term)C19H14N4 -- tetrapyrrolesC19H14O5S (in 1 term)C19H14O5S -- sulfonphthaleinsC19H15 (in 1 term)C19H15 -- fragmentationC19H16 (in 1 term)C19H16 -- bicycle rearrangementC19H17P (in 1 term)Ph3P+=CH2 -- ylidesC19H22N4 (in 1 term)C19H22N4 -- corrinoids (cobalamines, corphyrins, corrins, vitamin B12 compounds) C19H30 (in 1 term)C19H30 -- cyclo-C19H32 (in 3 terms)C19H32 -- cyclo-C19H32 -- abeo-C19H32 -- seco-C19H32O (in 1 term)C19H32O -- α (alpha), β (beta)C19H34 (in 1 term)C19H34 -- seco-C2 (in 7 terms)C–C -- lyasesC–C -- eclipsing strainC–C -- orbital symmetryC–C -- hydrolasesC–C -- ligases (synthetases)C–C -- photohydrationC–C -- symbiosisC20 (in 5 terms)C20 -- prostaglandinsC20 -- leukotrienesC20 -- terpenesC20 -- diterpenoidsC20 -- icosanoidsC20H12O5 (in 1 term)C20H12O5 -- xanthene dyesC20H14N4 (in 1 term)C20H14N4 -- porphyrinsC20H14O4 (in 1 term)C20H14O4 -- phthaleinsC20H16O2 (in 1 term)C20H16O2 -- fragmentationC20H19OP (in 1 term)C20H19OP -- betainesC20H20O5 (in 1 term)C20H20O5 -- lignansC20H38O2 (in 1 term)C20H38O2 -- prostaglandinsC22H23ClN2O8 (in 1 term)C22H23ClN2O8 -- tetracyclinesC22H26O6 (in 1 term)C22H26O6 -- lignansC23H22O6 (in 1 term)C23H22O6 -- rotenoidsC25 (in 2 terms)C25 -- terpenesC25 -- sesterterpenoidsC26H16 (in 2 terms)C26H16 -- helicenesC26H16 -- helicityC27H54N2 (in 1 term)C27H54N2 -- in-out isomerismC2H (in 1 term)HC≡C− -- carbanionC2H10O3Si3 (in 1 term)C2H10O3Si3 -- cyclosiloxanesC2H2 (in 5 terms)H2C=C: -- carbenesH2C=C: -- vinylidenes–CH=CH– -- heteroarenesC2H2 -- flow rate in flame emission and absorption spectrometryC2H2 -- local fraction atomizedC2H2O (in 2 terms)CH2=C=O -- heterocumulenesCH2=C=O -- isoelectronicC2H3 (in 1 term)CH2=CH– -- vinylic groupsC2H3AgO2 (in 1 term)C2H3AgO2 -- molecular rearrangementC2H3Cl (in 2 terms)C2H3Cl -- isodesmic reaction:Cl–CH=CH2 -- conjugated system (conjugation)C2H3Cl3 (in 1 term)C2H3Cl3 -- isodesmic reactionC2H3ClO (in 1 term)C2H3ClO -- acyl halidesC2H3N (in 1 term)CH3C≡N -- cyanidesC2H3NS (in 1 term)CH3SC≡N -- thiocyanatesC2H3O (in 1 term)CH3C(=O)– -- organyl groupsC2H3O2 (in 5 terms)–CH2CO2H -- prochiralityC2H3O2 -- ionizationC2H3O2 -- proton transfer reactionCH3CO2− -- Brønsted baseC2H3O2 -- nucleophilic catalysisC2H4 (in 14 terms)CH2=CH2 -- homodesmotic reactionC2H4 -- disproportionationC2H4 -- de Mayo reactionC2H4 -- isodesmic reactionC2H4 -- attachment–CH2–CH2– -- meso structures in polymersC2H4 -- ene reactionC2H4 -- sorptive insertion in surface catalysis+CH2–+CH2 -- dicarbenium ionsC2H4 -- hydrationC2H4 -- reactive adsorptionC2H4 -- negative hyper-conjugationC2H4 -- hyperconjugationC2H4 -- sudden polarizationC2H4Cl2 (in 1 term)C2H4Cl2 -- isodesmic reactionC2H4Cl2NO (in 2 terms)C2H4Cl2NO -- aminoxyl radicals(ClCH2)2N–O. -- nitroxidesC2H4Cl2O (in 1 term)C2H4Cl2O -- α-addition (alpha-addition)C2H4Cl3Pt (in 1 term)[PtCl3(CH2=CH2)]− -- chelationC2H4F (in 2 terms)C2H4F -- negative hyper-conjugationC2H4F -- hyperconjugationC2H4N (in 1 term)CH3–CH=N. -- iminyl radicalsC2H4O (in 1 term)C2H4O -- stoichiometryC2H4O2 (in 7 terms)C2H4O2 -- ionizationCH3CO2H -- Brønsted acidC2H4O2 -- nucleophilic catalysisCH3CO2H -- prochiralityC2H4O2 -- proton transfer reactionC2H4O2 -- leaving groupC2H4O2 -- catalytic hydrogenolysisC2H4O3 (in 2 terms)CH3C(=O)OOH -- per acidsCH3C(=O)OOH -- peroxy acidsC2H5 (in 3 terms)CH3CH2+ -- carbenium ionC2H5 -- disproportionationCH3CH2– -- organyl groupsC2H5Br (in 2 terms)C2H581Br+. -- isotopic molecular ionC2H579Br -- molecular ion in mass spectrometryC2H5BrO (in 1 term)BrCH2CH2OH -- halohydrinsC2H5Cl (in 1 term)C2H5Cl -- nucleophile (nucleophilic)C2H5N (in 1 term)MeN=CH2 -- heteroalkenesC2H5N3O2 (in 1 term)H2NNHC(=O)C(=O)NH2 -- semioxamazonesC2H5NO2 (in 1 term)H3N+CH2C(=O)O− -- zwitterionic compounds/zwitterionsC2H6 (in 6 terms)CH3–CH3 -- homodesmotic reactionC2H6 -- disproportionationC2H6 -- catalytic hydrogenolysisC2H6 -- dimerizationC2H6 -- pseudorotationCH313CH3 -- principal ion in mass spectrometryC2H6CuLi (in 1 term)Li+[CuMe2]− -- organometallic compoundsC2H6N2 (in 2 terms)C2H6N2 -- carboxamidinesC2H6N2 -- isoelectronicC2H6N4S2 (in 1 term)H2NC(=NH)SSC(=NH)NH2 -- formamidine disulfidesC2H6NO (in 1 term)C2H6NO -- aminoxidesC2H6O (in 5 terms)CH3–CH[2H]–OH -- singly labelledCH3OCH3 -- constitutional isomerismCH3CH2OH -- prochiralityCH3–CH2–[18O][2H] -- mixed labelledC2H6O -- hydrationC2H6O2 (in 1 term)HOCH2CH2OH -- glycolsC2H6S (in 1 term)MeCH2SH -- thiolsC2H7 (in 1 term)[C2H7]+ -- alkanium ionsC2H7As (in 1 term)CH3CH2AsH2 -- arsinesC2H7AsO2 (in 1 term)C2H7AsO2 -- arsinic acidsC2H7NS (in 2 terms)CH3CH2SNH2 -- amidesC2H5SNH2 -- sulfenamidesC2H7S (in 1 term)(CH3)2S+H -- onium compoundsC2HNa (in 1 term)NaC≡CH -- acetylidesC2N (in 1 term)(CN)2 -- pseudohalogensC3 (in 1 term)C=C=C -- chirality axisC30 (in 2 terms)C30 -- terpenesC30 -- triterpenoidsC30H42O (in 1 term)C30H42O -- carotenoidsC38H24Cl4 (in 1 term)C38H24Cl4 -- biradicalC3H3AsO (in 1 term)(CH3)3As=O -- arsine oxidesC3H3Bi (in 1 term)(CH3)3Bi -- bismuthinesC3H3N (in 1 term)CH2=CH–C≡N -- conjugated system (conjugation)C3H4 (in 2 terms)H2C=CHCH: -- carbenesH2C=CHC:H -- vinyl carbenesC3H4O2 (in 1 term)C3H4O2 -- de Mayo reactionC3H5 (in 4 terms)H2C=CHCH2+ -- allylic intermediatesC3H5 -- delocalizationCH3CH2C… -- alkylidynesCH2=CHCH2 -- allylic groupsC3H5NO (in 2 terms)C3H5NO -- lactamsHOCH2CH2C≡N -- cyanohydrinsC3H5NO3 (in 1 term)C3H5NO3 -- amic acidsC3H5NO3S (in 1 term)C3H5NO3S -- imidesC3H5NSe (in 1 term)CH3CH2SeCN -- selenocyanatesC3H5O (in 2 terms)C3H5O -- contributing structureC3H5O -- abstractionC3H6 (in 8 terms)c-(CH2)3 -- homodesmotic reaction+CH2CH2–+CH2 -- dicarbenium ionsC3H6.+ -- radical ionC3H6 -- corrinoids (cobalamines, corphyrins, corrins, vitamin B12 compounds) H2C.–CH2–C.H2 -- diradicalsCH3CH2CH: -- alkylidenes–CH2CH2CH2– -- hydrocarbylene groupsC3H6 -- ene reactionC3H6O (in 7 terms)C3H6O -- abstractionC3H6O -- epoxy compoundsC3H6O -- proton transfer reactionC3H6O -- Paterno–Büchi reactionC3H6O -- isoelectronicC3H6O -- fragmentationC3H6O -- dimerizationC3H6S (in 1 term)CH3CH2C(=S)H -- thioaldehydesC3H7 (in 2 terms)CH3CH2CH2+ -- carbenium ionCH3CH2C.H2 -- alkyl radicalsC3H7Br (in 1 term)C3H7Br -- molecular rearrangementC3H7ClO (in 1 term)ClCH2CH2CH2OH -- halohydrinsC3H7N (in 1 term)EtCH=NH -- aldiminesC3H7O (in 2 terms)C3H7O -- fragmentationC3H7O -- proton transfer reactionC3H8 (in 2 terms)C3H8 -- catalytic hydrogenolysisCH3CH2CH3 -- homodesmotic reactionC3H8O2S (in 2 terms)(CH3)2CHS(=O)OH -- sulfinic acidsC2H5S(=O)2CH3 -- sulfonesC3H9ClP (in 1 term)Cl(CH3)3P+ -- onium compoundsC3H9ClS (in 1 term)[(CH3)3S]+Cl− -- sulfonium compoundsC3H9N (in 2 terms)C3H9N -- ammoniumyl radical ionsC3H9N -- leaving groupC3H9NO (in 1 term)(CH3)3N+–O− -- zwitterionic compounds/zwitterionsC3H9NO2S (in 1 term)C3H9NO2S -- amidesC3O2 (in 2 terms)O=C=C=C=O -- heterocumulenesO=C=C=C=O -- oxocarbonsC40 (in 3 terms)C40 -- terpenesC40 -- carotenoidsC40 -- tetraterpenoidsC40H56 (in 2 terms)C40H56 -- retroC40H56 -- carotenoidsC40H56O2 (in 1 term)C40H56O2 -- carotenoidsC41H29NO (in 1 term)C41H29NO -- Dimroth–Reichardt ET ParameterC4H10 (in 1 term)C4H10 -- catalytic hydrogenolysisC4H10Mg (in 1 term)Et2Mg -- organometallic compoundsC4H10N (in 1 term)C4H10N -- pre-equilibrium (prior equilibrium)C4H10O (in 4 terms)C4H10O -- fragmentationCH3CH2OCH2CH3 -- ethersCH3CHOHCH2CH3 -- prochiralityC4H10O -- diastereotopicC4H10O3 (in 1 term)HC(OCH3)3 -- ortho estersC4H11N (in 1 term)(CH3)3N+–C−H2 -- ylidesC4H11NO (in 1 term)C4H11NO -- pre-equilibrium (prior equilibrium)C4H11O3PS (in 1 term)C4H11O3PS -- betainesC4H12N2 (in 1 term)C4H12N2 -- amine imidesC4H13NO (in 1 term)[(CH3)4N]+OH− -- quaternary ammonium compoundsC4H4N2 (in 2 terms)C4H4N2 -- pyrimidine basesC4H4N2 -- heteroarenesC4H4O2 (in 2 terms)HO[CH2]4OH -- glycolsC4H4O2 -- isolated double bondsC4H4S (in 1 term)C4H4S -- heteroarenesC4H5N (in 1 term)C4H5N -- indicated hydrogenC4H5NO2 (in 1 term)C4H5NO2 -- imidesC4H6 (in 9 terms)C4H6 -- attachmentC4H6 -- non-Kekulé moleculesC4H6 -- addition reactionCH2=C(C.H2)2 -- trimethylenemethanesCH2=CH–CH=CH2 -- dienesCH2=CH–CH=CH2 -- conjugated system (conjugation)C4H6 -- cheletropic reactionC4H6 -- s-cis, s-transCH2=CH–CH=CH2 -- homodesmotic reactionC4H6Br2 (in 1 term)C4H6Br2 -- addition reactionC4H6O (in 1 term)C4H6O -- oxa-di-π-methane rearrangementC4H6O2S (in 1 term)C4H6O2S -- cheletropic reactionC4H6O3 (in 2 terms)C4H6O3 -- acid anhydridesC4H6O3 -- nucleophilic catalysisC4H6O4 (in 1 term)C4H6O4 -- oxidative couplingC4H6O6 (in 1 term)C4H6O6 -- meso-compoundC4H7Br (in 1 term)C4H7Br -- allylic substitution reactionC4H7ClO2Zn (in 1 term)ClZnCH2C(=O)OEt -- organometallic compoundsC4H7NO (in 1 term)(CH3)2C(OH)C≡N -- cyanohydrinsC4H7Y (in 1 term)C4H7Y -- chain polymerizationC4H8 (in 4 terms)C4H8 -- addition reactionC4H8 -- cycloalkanesC4H8 -- antiC4H8 -- hyperconjugationC4H8Br2 (in 1 term)C4H8Br2 -- antiC4H8O (in 3 terms)C4H8O -- multiply labelledCH3CH2COCH3 -- prochiralityC4H8O -- allylic substitution reactionC4H8S (in 1 term)CH3C(=S)CH2CH3 -- thioketonesC4H9 (in 1 term)C4H9 -- hyperconjugationC4H9Br (in 1 term)C4H9Br -- addition reactionC4H9FO (in 1 term)C4H9FO -- diastereotopicC4H9N (in 1 term)C4H9N -- pre-equilibrium (prior equilibrium)C4H9O (in 1 term)C4H9O -- fragmentationC4O4 (in 1 term)C4O4 -- oxocarbonsC5 (in 1 term)C5 -- terpenesC5H10 (in 2 terms)C5H10 -- envelope conformationC5H10 -- ene reactionC5H10O (in 2 terms)C5H10O -- prochiralityC5H10O -- molecular rearrangementC5H10O2 (in 1 term)C5H10O2 -- molecular rearrangementC5H10O4 (in 1 term)C5H10O4 -- monosaccharidesC5H11NO2 (in 1 term)C5H11NO2 -- betainesC5H12 (in 1 term)Me4C -- symbiosisC5H12O4 (in 1 term)C(OCH3)4 -- ortho estersC5H12O5 (in 1 term)C5H12O5 -- meso-compoundC5H14NO4P (in 1 term)Me3N+–CH2CH2–OP(=O)(OH)O− -- phosphoC5H15Ta (in 1 term)TaMe5 -- homolepticC5H3BrN4 (in 1 term)C5H3BrN4 -- tele-substitutionC5H4 (in 2 terms)C5H4 -- nonclassical structureC5H4 -- electrocyclic reactionC5H4N2O (in 1 term)C5H4N2O -- topomerizationC5H4N4 (in 1 term)C5H4N4 -- purine basesC5H5N (in 2 terms)C5H5N+ -- organoheteryl groupsC5H5N -- nucleophilic catalysisC5H5N5 (in 1 term)C5H5N5 -- tele-substitutionC5H5NO (in 1 term)C5H5NO -- tautomerismC5H5NOS (in 1 term)C5H5NOS -- penemsC5H5OP (in 1 term)C5H5OP -- indicated hydrogenC5H5P (in 1 term)C5H5P -- indicated hydrogenC5H7NOS (in 1 term)C5H7NOS -- penamsC5H7O2 (in 1 term)C5H7O2 -- carbanionC5H8 (in 3 terms)C5H8 -- di-π-methane rearrangementC5H8 -- sigmatropic rearrangement[CH2=C(CH3)CH=CH2] -- terpenesC5H8O2 (in 1 term)C5H8O2 -- de Mayo reactionC5H8O3 (in 1 term)HC(=O)CH2CH2CH2C(=O)OH -- oxo carboxylic acidsC5H8O5 (in 1 term)HO2CCH2CHOHCH2CO2H -- prochiralityC5H8O7 (in 1 term)C5H8O7 -- pseudo-asymmetric carbon atomC5H8OS2 (in 1 term)CH3C(=O)SC(=S)CH2CH3 -- thioanhydridesC5H9Br (in 1 term)C5H9Br -- molecular rearrangementC5H9N (in 1 term)C5H9N -- aza-di-π-methane rearrangementC5H9NO2 (in 1 term)C5H9NO2 -- imino acidsC5H9O (in 1 term)C5H9O -- ambidentC6H10 (in 4 terms)C6H10 -- degenerate rearrangementC6H10 -- half-chairC6H10 -- attachmentC6H10 -- carbenesC6H10Br2NiP2 (in 1 term)Ni[(CH3)2PCH2CH2P(CH3)2]Br2 -- κ (kappa) in inorganic nomenclatureC6H10BrF (in 1 term)C6H10BrF -- antiC6H10O3 (in 1 term)C6H10O3 -- tautomerismC6H10O4 (in 1 term)C6H10O4 -- enosesC6H10O7 (in 2 terms)C6H10O7 -- uronic acidsC6H10O7 -- ketoaldonic acidsC6H11BrO5 (in 1 term)C6H11BrO5 -- anomeric effectC6H11NO (in 2 terms)C6H11NO -- prochiralityC6H11NO -- lactamsC6H11S (in 1 term)C6H11S -- sulfonium compoundsC6H12 (in 4 terms)C6H12 -- oxidative additionC6H12 -- chair, boat, twistC6H12 -- Paterno–Büchi reactionC6H12 -- cyclo-C6H12O2 (in 1 term)C6H12O2 -- dimerizationC6H12O3 (in 1 term)C6H12O3 -- acetonidesC6H12O5 (in 1 term)C6H12O5 -- α (alpha), β (beta)C6H12O6 (in 4 terms)C6H12O6 -- aldosesC6H12O6 -- Haworth representationC6H12O6 -- ketosesC6H12O6 -- α (alpha), β (beta)C6H12O7 (in 1 term)C6H12O7 -- aldonic acidsC6H12Si (in 1 term)C6H12Si -- di-π-silane rearrangementC6H13NO5 (in 1 term)C6H13NO5 -- amino sugarsC6H14 (in 1 term)C6H14 -- cyclo-C6H14LiN (in 1 term)C6H14LiN -- amidesC6H14N (in 1 term)C6H14N -- abstractionC6H14O6 (in 1 term)C6H14O6 -- Haworth representationC6H15B (in 1 term)Et3B -- organometallic compoundsC6H15N (in 1 term)C6H15N -- abstractionC6H4 (in 1 term)C6H4 -- aryneC6H4NS2 (in 1 term)C6H4NS2 -- Herz compoundsC6H4O2 (in 2 terms)C6H4O2 -- quinonesC6H4O2 -- quinhydronesC6H5 (in 1 term)C6H5 -- aryl cationsC6H5AsCa (in 1 term)CaAsPh -- arsenidesC6H5I (in 1 term)C6H5I -- isotopic scramblingC6H5KN2O (in 1 term)PhN=NO−K+ -- diazoatesC6H5N2 (in 2 terms)C6H5N2 -- isotopic scramblingPhN+≡N -- diazonium saltsC6H5N3 (in 1 term)PhN3 -- azidesC6H5NO2 (in 1 term)C6H5NO2 -- electrophile (electrophilic)C6H5Y (in 1 term)C6H5Y -- Hammett equation (Hammett relation)C6H6 (in 7 terms)C6H62+ -- nonclassical structureC6H6 -- Kekulé structure (for aromatic compounds)C6H6 -- electrophile (electrophilic)C6H6 -- catalytic hydrogenolysisC6H6 -- homodesmotic reactionC6H6 -- fulvenesC6H6.+ -- radical ionC6H6N2 (in 1 term)C6H6N2 -- quinonimines (quinone imines)C6H6N2O (in 1 term)PhN=NOH -- diazoatesC6H6NNa (in 1 term)C6H6NNa -- anilidesC6H6O (in 2 terms)C6H6O -- valence tautomerizationC6H6O -- arene epoxidesC6H6O2 (in 1 term)C6H6O2 -- quinhydronesC6H6O4 (in 1 term)C6H6O4 -- cycloadditionC6H6O4S (in 1 term)PhS(=O)2OOH -- peroxy acidsC6H6OS (in 1 term)PhSOH -- sulfenic acidsC6H7 (in 1 term)C6H7+ -- arenium ionsC6H7N (in 3 terms)C6H5NH2 -- transformationC6H7N -- isotopic scramblingC6H7N -- ammoniumyl radical ionsC6H8 (in 1 term)C6H8 -- electrocyclic reactionC6H8N2S (in 1 term)PhS(=NH)NH2 -- sulfinamidinesC6H8NO2P (in 1 term)C6H8NO2P -- amidesC6H9Br (in 1 term)C6H9Br -- antiC6H9N3O2 (in 1 term)C6H9N3O2 -- pros in histidine nomenclatureC6H9NOS (in 1 term)C6H9NOS -- cephamsC6H9Sb (in 1 term)(CH2=CH)3Sb -- stibinesC6N4 (in 1 term)C6N4 -- π-adductC7H10BrF (in 1 term)C7H10BrF -- endo, exo, syn, antiC7H12 (in 1 term)C7H12 -- antiC7H12ClN (in 1 term)C7H12ClN -- acyl halidesC7H14N2 (in 1 term)C7H14N2 -- carboxamidinesC7H14O (in 1 term)C7H14O -- Norrish Type II photoreactionC7H14O6 (in 1 term)C7H14O6 -- anomeric effectC7H16 (in 1 term)C7H16 -- catalytic dehydrocyclizationC7H4ClO2 (in 1 term)C7H4ClO2 -- isodesmic reactionC7H4O3S2 (in 1 term)C7H4O3S2 -- cyclic acid anhydrides (cyclic anhydrides)C7H5ClO2 (in 1 term)C7H5ClO2 -- isodesmic reactionC7H5NO (in 1 term)PhOCN -- cyanatesC7H5O2 (in 1 term)C7H5O2 -- isodesmic reactionC7H6 (in 1 term)C7H6 -- annulenylidenesC7H6FeO2S (in 1 term)[Fe(CO)3(C4H6SO)] -- η (eta or hapto) in inorganic nomenclatureC7H6N (in 1 term)C7H6N -- nitrilium ionsC7H6O (in 2 terms)C7H6O -- quinomethanesC7H6O -- troponesC7H6O2 (in 2 terms)C7H6O2 -- isodesmic reactionC7H6O2 -- tropolonesC7H6OS (in 1 term)PhC(=S=O)H -- sulfinesC7H7 (in 5 terms)C7H7 -- common-ion effect (on rates)C7H7 -- benzylic intermediates(C7H72+) -- mass-to-charge ratioC7H7+ -- tropylium ionsC7H7 -- hyperconjugationC7H7Br (in 1 term)C7H7Br -- leaving groupC7H7BrO (in 1 term)C7H7BrO -- cine-substitutionC7H7Cl (in 1 term)C7H7Cl -- common-ion effect (on rates)C7H7NO (in 1 term)C7H7NO -- amidesC7H7NS (in 1 term)PhC(=S)NH2 -- thioC7H8 (in 5 terms)C7H8 -- cycloadditionC7H8 -- catalytic hydrogenolysisC7H8 -- hyperconjugationC7H8 -- tropilidenesC7H8 -- catalytic dehydrocyclizationC7H8NO (in 1 term)C7H8NO -- nucleophilic catalysisC7H8O (in 1 term)C7H8O -- common-ion effect (on rates)C7H9N (in 1 term)C7H9N -- catalytic hydrogenolysisC7H9NO (in 1 term)C7H9NO -- cine-substitutionC7H9NO2S (in 1 term)PhS(=O)2NHCH3 -- sulfonamidesC7H9NOS (in 1 term)PhS(=O)NHCH3 -- sulfinamidesC8H10S (in 1 term)C8H10S -- leaving groupC8H11ClO (in 1 term)C8H11ClO -- α (alpha), β (beta)C8H11NOS (in 1 term)(CH3)2S(=O)=NPh -- sulfoximidesC8H12 (in 2 terms)C8H12 -- electrocyclic reactionC8H12 -- propellanesC8H12N (in 1 term)C8H12N -- aminium ionsC8H12O5 (in 1 term)C8H12O5 -- tautomerismC8H14 (in 1 term)C8H14 -- planar chiralityC8H14O4 (in 1 term)C8H14O4 -- monosaccharidesC8H16 (in 3 terms)C8H16 -- tub conformationC8H16 -- crown conformationC8H16 -- extrusion transformationC8H16N2 (in 1 term)C8H16N2 -- extrusion transformationC8H18 (in 1 term)C8H18 -- catalytic hydrogenolysisC8H18O (in 1 term)C8H18O -- zig-zag projectionC8H20N (in 1 term)(CH3CH2)4N+ -- onium compoundsC8H4O (in 1 term)C8H4O -- heteroarynesC8H5NO (in 1 term)C8H5NO -- cyanidesC8H6CrO (in 1 term)[Cr(CO)4(C4H6)] -- η (eta or hapto) in inorganic nomenclatureC8H6S2 (in 1 term)C8H6S2 -- isolated double bondsC8H8 (in 6 terms)C8H8 -- chain reactionC8H8 -- non-Kekulé moleculesC8H8 -- chain transferC8H8 -- quinomethanesC8H8 -- alternantC8H8 -- polyhedranesC8H8ClNO (in 1 term)C8H8ClNO -- molecular rearrangementC8H8O4 (in 1 term)C8H8O4 -- polyketidesC8H8O4S (in 1 term)C8H8O4S -- acid anhydridesC8H9 (in 1 term)(C8H9+) -- homoaromaticC8H9ClO (in 1 term)PhCH(OH)CH2Cl -- halohydrinsC8H9N (in 1 term)PhCH=NMe -- aldiminesC8H9NO (in 3 terms)C6H5NHCOCH3 -- transformationC8H9NO -- molecular rearrangementC8H9NO -- anilidesC8K (in 1 term)C8K -- intercalation reactionC9H10O (in 1 term)C9H10O -- molecular rearrangementC9H10O2 (in 2 terms)C9H10O2 -- leaving groupC9H10O2 -- catalytic hydrogenolysisC9H12 (in 1 term)C9H12 -- π-adductC9H12S (in 1 term)(CH3)2S+–C−HPh -- ylidesC9H14 (in 1 term)C9H14 -- Bredt's ruleC9H14O4 (in 1 term)C9H14O4 -- tautomerismC9H16 (in 1 term)C9H16 -- spiro compoundsC9H16O2 (in 1 term)C9H16O2 -- tritactic polymerC9H18O (in 1 term)C9H18O -- Paterno–Büchi reactionC9H19NO4 (in 1 term)C9H19NO4 -- glycosylaminesC9H5N (in 1 term)C9H5N -- heteroarynesC9H6O2 (in 2 terms)C9H6O2 -- isocoumarinsC9H6O2 -- coumarinsC9H8Cl3 (in 1 term)C9H8Cl3 -- chain transferC9H8N2 (in 1 term)C9H8N2 -- dipyrrinsCa (in 3 terms)Ca2+ -- interfering substance in electroanalytical chemistryCa2+ -- selectivity coefficientCa2+ -- ionic conductivityCaFeO3 (in 1 term)CaFeO3 -- disproportionationCB (in 2 terms)B–C -- potential-energy (reaction) surfaceBC -- repulsive potential-energy surfaceCBr4 (in 1 term)CBr4 -- rotator phase transitionCBrCl3 (in 1 term)CBrCl3 -- telomerizationCCaO3 (in 1 term)CaCO3 -- monotropic transitionCCl (in 1 term)C–Cl -- coordinationCCl2 (in 2 terms):CCl2 -- carbenesCCl2 -- α-addition (alpha-addition)CCl2F2 (in 1 term)CF2Cl2 -- background concentration (level) in atmospheric chemistryCCl3 (in 3 terms)Cl3C− -- carbanionCl3C. -- telomerizationCl3C. -- chain transferCClF3 (in 1 term)CF3Cl -- background concentration (level) in atmospheric chemistryCd (in 1 term)Cd -- resonance lampCdHe (in 1 term)HeCd -- ion laserCdHgTe (in 1 term)HgCdTe -- photoconductive detectorCdS (in 2 terms)CdS -- pressure-induced transitionCdS -- photoconductive detectorCF (in 1 term)C–F -- negative hyper-conjugationCH (in 12 terms)CH -- strain energyCH -- agosticC–H -- symbiosisC–H -- steric isotope effectHC… -- carbynesCH -- bicycle-pedal (BP) mechanismC–H -- hypercoordinationC–H -- persistent–CH= -- dipyrrinsCH -- carbaboranes–CH= -- quinonesC–H -- σ, π (sigma, pi)CH2 (in 14 terms)CH2 -- hypercoordination–CH2– -- pyrromethenesCH2 -- tropylium ionsH2C: -- alkylidenes–CH2– -- hydrocarbylene groupsCH2 -- strain energyH2C -- silyleneCH2 -- insertionH2C: -- carbenesCH2 -- homoconjugation–CH2– -- meso structures in polymersH2C.+ -- carbynium ionsH2C.+ -- carbene radical cationsCH2 -- tropyl radicalsCH2Cl (in 1 term)ClCH2– -- organyl groupsCH2N2 (in 3 terms)CH2=N2 -- diazo compoundsHN=C=NH -- carbodiimidesCH2=N=N -- isoelectronicCH2Na2O4 (in 1 term)Na2CO3·10H2O -- efflorescenceCH2O (in 4 terms)CHOH -- oxo compoundsCHOH -- prochiralityCH2O -- fragmentationCH2O -- smog chamber in atmospheric chemistryCH3 (in 13 terms)CH3 -- allylic intermediatesCH3 -- dimerizationCH3 -- colligationCH3 -- bond-dissociation energyCH3+ -- even-electron ionCH3 -- strain energyCH3 -- fragmentationCH3 -- chain reaction.CH3 -- radical (free radical)CH3 -- benzylic intermediatesCH3(2A'2) -- isogyric reactionCH3 -- abstractionCH3 -- σ, π (sigma, pi)CH3Cl (in 2 terms)CH3Cl -- molecular rearrangementCH3Cl -- substitution reactionCH3ClO2S (in 1 term)CH3ClO2S -- acyl halidesCH3F (in 1 term)CH3F -- molecular laserCH3I (in 1 term)CH3I -- identity reactionCH3IMg (in 1 term)MeMgI -- organometallic compoundsCH3N (in 2 terms)CH3N: -- carbene analoguesCH3N: -- nitrenesCH3NaS (in 1 term)CH3S−Na+ -- thiolatesCH3NO2 (in 2 terms)CH3NO2 -- azinic acidsCH3NO2 -- carbamatesCH3NO2S (in 1 term)CH3N=S(=O)2 -- sulfonylaminesCH3O (in 3 terms)–CH2OH -- uronic acidsCH3O+ -- oxylium ionsOCH3 -- π-electron acceptor/donor groupCH3S (in 4 terms)CH3–S– -- sulfenyl groupsCH3S+ -- sulfenylium ionsMeS– -- organyl groupsCH3S. -- sulfenyl radicalsCH4 (in 13 terms)CH4 -- multiply labelledCH4 -- reduced speciesCH4 -- molecular entityCH4 -- stoichiometryCH4 -- bond energy (mean bond energy)CH4 -- composition of pure air in atmospheric chemistryCH4(1A1) -- isogyric reactionCH4 -- isotopologue12CH4+ -- isotope pattern in mass spectrometryCH4 -- spectator mechanismCH4 -- symbiosisCH4 -- bond-dissociation energyCH4 -- abstractionCH4FN (in 1 term)CH4FN -- negative hyper-conjugationCH4N2O (in 1 term)CH4N2O -- isoureasCH4N4 (in 1 term)H2NN=CHN=NH -- formazansCH4O (in 7 terms)CH3OH -- Brønsted acid(CH3OH2+) -- lyonium ionCH4O -- substitution reactionCH4O -- line formulaCH4O -- oxidative couplingCH4O -- α-addition (alpha-addition)CH3OH -- amphiprotic (solvent)CH4O4 (in 1 term)C(OH)4 -- ortho acidsCH4Si (in 1 term)H2Si=CH2 -- heteroalkenesCH5 (in 2 terms)CH5+ -- coordination number+CH5 -- alkanium ionsCH5B (in 1 term)CH5B -- spectator mechanismCH5N3O (in 1 term)NH2NHC(=O)NH2 -- semicarbazonesCH5P (in 1 term)CH3PH2 -- phosphinesCHN (in 4 terms)HN+≡C− -- isocyanidesC=NH -- iminesHC≡N -- nitrilesHC≡N -- cyanidesCHNO (in 3 terms)HN=C=O -- isocyanatesHC≡N+–O− -- fulminatesHOC≡N -- cyanatesCHNS (in 1 term)HSC≡N -- thiocyanatesCHNSe (in 1 term)HSeCN -- selenocyanatesCHO (in 1 term)–CHO -- characteristic group in organic nomenclatureCHO2 (in 2 terms)–COOH -- characteristic group in organic nomenclature–COOH -- polyacidCIN (in 1 term)ICN -- pseudohalogensCKN (in 1 term)KCN -- order-disorder transitionCKNO (in 1 term)KOCN -- cyanatesCl (in 20 terms)Cl -- abstractionCl− -- pHCl -- apicophilicity–Cl -- characteristic group in organic nomenclatureCl− -- gas sensing electrodeCl− -- nucleofugeCl -- Herz compoundsCl. -- chain reactionCl− -- Brønsted baseCl -- substitution reactionCl -- excimer lampCl− -- selectivity coefficientCl -- nucleophile (nucleophilic)Cl. -- radical (free radical)Cl -- common-ion effect (on rates)Cl+ -- halonium ionsCl -- ionizationCl− -- gravimetric methodCl -- photolysisCl− -- conjugate acid–base pairCl2 (in 4 terms)Cl2 -- gas sensing electrodeCl2 -- polarizability2Cl− -- mean activity of an electrolyte in solutionCl2 -- excimer lampCl2F (in 1 term)(Cl2F+) -- onium compoundsCl2Zn (in 1 term)ZnCl2 -- activated carbonCl4Rb2Zn (in 1 term)Rb2ZnCl4 -- commensurate–incommensurate transitionClCs (in 4 terms)CsCl -- thermally-induced transitionCsCl -- structural transitionCsCl -- first-order phase transitionCsCl -- dilational (dilatational) transitionClH (in 9 terms)HCl -- oxoacidsClH -- reaction path degeneracyHCl -- Brønsted acidClH -- isotope exchangeClH -- molecular rearrangementHCl -- levelling effectClH -- abstractionHCl -- internal filling solution of a glass electrodeHCl -- conjugate acid–base pairClH2 (in 1 term)(H2Cl+) -- onium compoundsClH4N (in 1 term)NH4Cl -- structural transitionClHO (in 1 term)HOCl -- oxoacidsClHO4 (in 1 term)HClO4 -- levelling effectClK (in 2 terms)KCl -- membrane emfKCl -- Donnan emf (Donnan potential)ClKr (in 1 term)KrCl -- excimer lampClLiO4 (in 1 term)LiClO4 -- special salt effectClNa (in 4 terms)NaCl -- pressure-induced transitionNaCl -- thermally-induced transitionNaCl -- structural transitionNaCl -- first-order phase transitionClXe (in 2 terms)XeCl -- excimer lampXeCl -- excimer laserCN (in 10 terms)CN -- apicophilicityCN− -- interfering substance in electroanalytical chemistry–C≡N -- characteristic group in organic nomenclatureC–N -- lyasesCN− -- prochiralityCN− -- order-disorder transitionCN− -- pseudohalogens–CN -- carbonitrilesC–N -- hydrolasesC–N -- ligases (synthetases)CNNa (in 1 term)NaCN -- cyanidesCNNaO (in 1 term)Na+[–C≡N+O−] -- fulminatesCNO (in 1 term)–NCO -- characteristic group in organic nomenclatureCNS (in 2 terms)N≡C–S− -- organoheteryl groupsSCN− -- pseudohalogensCNS2 (in 1 term)(SCN)2 -- pseudohalogensCO (in 10 terms)C=O -- carbonyl compoundsC=O -- oxo compoundsCO -- photodecarbonylationCO -- isoelectronicCO -- oxocarbonsCO -- air pollutantC–O -- lyasesC–O -- hydrolasesC–O -- ligases (synthetases)–C(=O)– -- quinonesCo (in 1 term)Co3+ -- spin-state transitionCO2 (in 15 terms)CO2 -- sublimationCO2 -- laserCO2 -- reduced speciesCO2 -- photodecarboxylationCO2 -- photophosphorylationCO2 -- molecular laserCO2 -- composition of pure air in atmospheric chemistryO=C=O -- heterocumulenesCO2 -- acid rain in atmospheric chemistryO=C=O -- oxocarbonsCO2 -- cryogenic samplingCO2 -- sanitary land fillCO2 -- photosynthesisCO2 -- greenhouse effect in atmospheric chemistryCO2 -- carbon dioxide laser (CO2 laser)CoLaO3 (in 1 term)LaCoO3 -- spin-state transitionCr (in 2 terms)Cr3+ -- solid state lasersCr3+ -- ruby laserCS (in 1 term)C–S -- ligases (synthetases)Cu (in 1 term)Cu -- Penning gas mixtureCuI (in 1 term)CuI -- chelationCuMn (in 1 term)Cu–Mn -- spin-glass transitionCuZn (in 1 term)CuZn -- second-order transitionCY (in 1 term)C–Y -- bisecting conformation (eclipsing conformation)F (in 7 terms)F -- apicophilicityF -- negative hyper-conjugationF -- hydrogen bondF -- excimer lampF -- branching ratioF+ -- halonium ionsF -- hyperconjugationF2P (in 1 term)Fap–P–Fap -- hypervalencyF5P (in 2 terms)PF5 -- hypervalencyPF5 -- polytopal rearrangementF5Sb (in 1 term)SbF5 -- superacidF6S (in 1 term)SF6 -- air mass in atmospheric chemistryF6U (in 1 term)UF6 -- gaseous diffusion separator in atmospheric chemistryFe (in 10 terms)Fe2+ -- Verwey transitionFe -- exchange-inversion transitionFe3+ -- order-disorder transitionFe3+ -- Fenton reaction57Fe -- quadrupole splitting in Mössbauer spectroscopyFe3+ -- equivalent entityFe -- oxidized species57Fe -- nuclear quadrupole moment (spectroscopic)FeII -- spin crossoverFeII -- salt form of an ion exchangerFe2O3 (in 1 term)α-Fe2O3 -- Morin transitionFe3O4 (in 1 term)Fe3+[Fe3+Fe2+]O4 -- Verwey transitionFeLiO2 (in 1 term)LiFeO2 -- order-disorder transitionFeMo (in 1 term)Mo–Fe -- spin-glass transitionFeRh (in 1 term)FeRh -- exchange-inversion transitionFH (in 4 terms)HF -- molecular laserHF -- superacidHF -- chemical laserHF -- branching ratioFH2 (in 1 term)(H2F+) -- onium compoundsFHO3S (in 1 term)HSO3F -- superacidFKr (in 2 terms)KrF -- excimer laserKrF -- liquid ion laserH (in 96 terms)H -- selenidesH -- bismuthinesH+ -- pHH -- selenoxidesH -- oxime O-ethersH+ -- extraction (equilibrium) constantH -- nucleophilic catalysisH -- hydronH -- multiply labelledH+ -- gas sensing electrode2H+ -- deuteriumH+ -- tautomerismH -- hydrogenH -- selonesH+ -- electrofugeH -- urethanes (urethans)H -- extended Hammett equationH -- ketonesH -- ketoximesH -- Schiff bases (Schiff's bases)H -- hemiketalsH -- sulfenyl radicalsH+ -- isoionicH+ -- ligandsH+ -- catalytic coefficientH -- hemiaminalsH -- stibinesH -- telluridesH -- ethers1H -- chemical shift2H -- deuteronH -- thioethersH -- dual substituent-parameter equationH -- azomethinesH -- thioketone S-oxidesH -- pseudo acidsH -- branching chain reactionH -- imines1H -- aromatic3H -- electron capture detector in gas chromatographyH -- alkyl groupsH -- estersH -- sulfenylium ionsH -- trioxidesH -- electrophile (electrophilic)H+ -- protonation constantH -- polysulfanesH -- nitronesH -- selenolsH+ -- Rutherford backscattering (RBS)H -- sulfenic acidsH+ -- specific acid–base catalysisH -- thioketonesH -- diazoamino compoundsH -- bond energy (mean bond energy)H -- sulfenamidesH -- bond-dissociation energyH+ -- equivalent entityH -- siliconesH -- gas-phase acidityH -- sulfenyl groupsH -- Hammett equation (Hammett relation)H -- sulfoxidesH -- gas-phase basicityH -- polysulfidesH -- hydrazidesH -- enolsH -- alkoxyaminesH -- ortho estersH -- phosphines3H− -- tritiumH+ -- protiumH -- acetalsH -- selenenic acidsH+ -- Haber–Weiss reactionH -- arsinesH -- reaction path degeneracyH -- thiohemiacetalsH -- ketalsH -- fragmentationH -- thioacetalsH -- sulfonesH(2S) -- isogyric reactionH -- thiolsH -- addition reactionH -- spin polarizationH -- hemiacetalsH -- Brønsted relationH -- ketiminesH+ -- standard hydrogen electrodeH -- sulfidesH -- common-ion effect (on rates)H -- hyperconjugationH+ -- leaving groupH+ -- general acid–base catalysisH -- carbene analoguesH10N2Si3 (in 1 term)H3SiNHSiH2NHSiH3 -- silazanesH2 (in 5 terms)H2 -- pHH2 -- gas sensing electrodeH2 -- catalytic hydrogenolysisH2(1Σ+g) -- isogyric reactionH2 -- standard hydrogen electrodeH2I (in 1 term)(H2I+) -- onium compoundsH2KN (in 1 term)H2KN -- isotopic scramblingH2N (in 5 terms)NH2 -- amides–NH2 -- characteristic group in organic nomenclatureNH2 -- phosphoglyceridesH2N. -- aminyl radicals(H2N:+) -- nitrenium ionsH2N2 (in 5 terms)=NNH2 -- hydrazidinesH2NN: -- carbene analogues–NHNH– -- hydrazo compounds=NNH2 -- hydrazonesHN=NH -- azo compoundsH2N2O (in 1 term)H2NNO -- nitrosamidesH2N2O2 (in 1 term)O2NNH2 -- nitraminesH2N2S (in 1 term)HN=S=NH -- sulfur diimidesH2NO (in 3 terms)H2N–O− -- aminoxidesH2N–O. -- nitroxides–NHOH -- hydroxamic acidsH2NP (in 1 term)HP=NH -- phosphazenesH2O (in 19 terms)H2O -- oxenium ionsH2O -- common-ion effect (on rates)H2O -- ionizationH2O -- composition of pure air in atmospheric chemistryH2O -- temperature lapse rate in atmospheric chemistryH2O -- Brønsted acidH2O -- supersaturationH2O -- Brønsted baseH2O -- oxidative couplingH2O -- nucleophilic catalysisH2O -- anhydro basesH2O -- hydrationH2O -- branching chain reactionH2O -- pre-equilibrium (prior equilibrium)H2O -- gaseous diffusion separator in atmospheric chemistryH2O -- Haber–Weiss reactionH2O -- sanitary land fillH2O -- photosynthesisH2O -- amphiprotic (solvent)H2O2 (in 5 terms)HOOH -- hydroperoxidesH2O2 -- Fenton reactionH2O2 -- oxidation stateH2O2 -- Haber–Weiss reactionH2O2 -- smog chamber in atmospheric chemistryH2O2S (in 2 terms)HOSOH -- oxoacidsHS(=O)OH -- sulfinic acidsH2O3 (in 1 term)HOOOH -- trioxidesH2O3P (in 4 terms)–PO3H2 -- characteristic group in organic nomenclature–P(=O)(OH)2 -- phospho–P(=O)(OH)2 -- phosphono–PO3H2 -- polyacidH2O3S (in 1 term)HS(=O)2OH -- sulfonic acidsH2O4S (in 7 terms)(HO)2SO2 -- oxoacidsH2SO4 -- reduced speciesH2SO4 -- Brønsted acidH2SO4 -- equivalent entityH2SO4 -- oxidation stateH2SO4 -- haze in atmospheric chemistryH2SO4 -- amphotericH2S (in 11 terms)H2S -- hydrocracking unitH2S -- reduced speciesSH2 -- bonding numberH2S -- sulfenylium ionsH2S -- acid-labile sulfurH2S -- oxidized speciesH2S -- sulfenyl groupsH2S -- sulfenyl radicalsH2S -- oxidation stateH2S -- sulfanesH2S -- air pollutantH2S2 (in 1 term)HS2H -- polysulfanesH2Se (in 1 term)H2Se -- selenidesH2Si (in 1 term)H2Si -- silyleneH2Te (in 1 term)H2Te -- telluridesH3N (in 5 terms)H3N.+ -- ammoniumyl radical ionsH3N -- aminiumyl radical ionsNH3 -- Brønsted acidNH3 -- Rydberg stateH3N -- tele-substitutionH3N2 (in 2 terms)–NHNH2 -- hydrazidinesH2NN.H -- verdazyl radicalsH3N3 (in 1 term)NH2N=NH -- triazenesH3NO (in 1 term)H2N–OH -- hydroxylaminesH3NO2 (in 1 term)H3NO2 -- azinic acidsH3NO3 (in 1 term)H3NO3 -- azonic acidsH3NO3S (in 1 term)H2NS(=O)2OH -- sulfamic acidsH3NS (in 1 term)H2S=NH -- sulfimidesH3O (in 4 terms)H3O+ -- oxonium ionsH3O -- ionizationH3O+ -- Brønsted acid(H3O+) -- onium compoundsH3O2P (in 2 terms)HP(OH)2 -- phosphonous acidsH2P(=O)OH -- phosphinic acidsH3O3P (in 2 terms)P(OH)3 -- oxoacidsHP(=O)(OH)2 -- phosphonic acidsH3O4P (in 1 term)H3PO4 -- electrolytic hygrometerH3OP (in 1 term)H2POH -- phosphinous acidsH3P (in 2 terms)PH3 -- phosphinesPH3 -- phosphanesH3S (in 1 term)(H3S+) -- onium compoundsH3Sb (in 2 terms)SbH3 -- stibanesSbH3 -- stibinesH3Se (in 1 term)(H3Se+) -- onium compoundsH3Si (in 2 terms)H3Si– -- silyl groupsH3Si. -- silyl radicalsH3Sn (in 1 term).SnH3 -- radical (free radical)H3Te (in 1 term)(H3Te+) -- onium compoundsH4N (in 1 term)(H4N+) -- onium compoundsH4N2 (in 1 term)H2NNH2 -- hydrazinesH4NP (in 1 term)H3P=NH -- phosphazenesH4NY (in 1 term)(NH4+)Y− -- quaternary ammonium compoundsH4OSi (in 1 term)H3SiOH -- silanolsH4P (in 1 term)(H4P+) -- onium compoundsH4Sb (in 1 term)(H4Sb+) -- onium compoundsH5N3 (in 1 term)NH2NHNH2 -- triazanesH5NO4S (in 1 term)NH4HSO4 -- haze in atmospheric chemistryH5P (in 1 term)PH5 -- phosphoranesH6S (in 1 term)SH6 -- bonding numberHe (in 4 terms)3He -- helionHe -- atomic laserHe+ -- Rutherford backscattering (RBS)4He -- α-particle (alpha-particle)Hg (in 1 term)Hg -- resonance lampHI (in 1 term)HI -- levelling effectHLi (in 2 terms)HLi -- topochemical reactionLiH -- oxidation stateHN (in 7 terms)–NH -- anion exchangerHN: -- carbene analoguesHN: -- nitrenesNH -- silasesquiazanes–NH– -- silazanesHN -- Lewis acidHN= -- imino acidsHN3 (in 2 terms)–N=N–NH– -- aziminesHN3 -- azidesHNO (in 1 term)=NOH -- hydroximic acidsHNO2 (in 2 terms)HON=O -- oxoacidsHONO -- smog chamber in atmospheric chemistryHNO3 (in 1 term)HNO3 -- smog chamber in atmospheric chemistryHO (in 36 terms)OH– -- anion exchangerOH− -- general acid–base catalysis–OH -- vinylic groups–OH -- hydrazidinesHO -- allylic substitution reaction–OH -- characteristic group in organic nomenclatureOH -- erythro structures in a polymerOH− -- isoionicHO -- substitution reactionOH− -- catalytic coefficient–OH -- benzylic groupsOH -- phosphoglyceridesOH. -- Fenton reactionOH -- phosphoramidesHO -- anhydro basesOH -- oxo compounds–OH -- cresolsOH− -- kinetic equivalenceOH− -- specific acid–base catalysisHO -- pre-equilibrium (prior equilibrium)–OH -- allylic groupsHO+ -- oxylium ionsOH -- anilidesOH− -- Brønsted base–OH -- sulfenamidesHO -- decay rate in atmospheric chemistry–OH -- hydrazides–OH -- alcohols–OH -- hydroxamic acidsHO -- molecular rearrangementHO+ -- acyl speciesOH− -- Haber–Weiss reactionHO -- colligationOH -- branching chain reactionHO -- smog chamber in atmospheric chemistry–OH -- peroxy acidsHO2 (in 1 term)–OOH -- peroxy acidsHO3S (in 2 terms)–SO3H -- characteristic group in organic nomenclature–SO3H -- polyacidHO4S (in 2 terms)HSO4− -- Brønsted acidHSO4− -- Brønsted baseHSi (in 2 terms)Si–H -- agosticSiH -- silasesquiazanesI (in 5 terms)I− -- identity reaction129I -- nuclear quadrupole moment (spectroscopic)123I -- radioiodinationI -- excimer lampI+ -- halonium ionsI2 (in 2 terms)I2 -- dopantI2 -- excimer lampIK (in 1 term)IK -- isotopic scramblingIO2 (in 1 term)IO2 -- characteristic group in organic nomenclatureIXe (in 1 term)XeI -- excimer lampK (in 1 term)K -- syntectic reactionKMnO4 (in 1 term)KMnO4 -- equivalent entityKr (in 3 terms)Kr -- excimer lampKr -- resonance lampKr -- liquid ion laserKr2 (in 1 term)Kr2 -- excimer lampKZn (in 1 term)K-Zn -- syntectic reactionKZn13 (in 1 term)KZn13 -- syntectic reactionLa (in 1 term)La3+ -- ionic conductivityLi (in 1 term)Li+ -- order-disorder transitionLiMn2O4 (in 1 term)Li[Mn2]O4 -- topochemical reactionMg (in 2 terms)Mg -- solute-volatilization interference in flame spectroscopyMg2+ -- selectivity coefficientMg2O4Si (in 1 term)Mg2SiO4 -- reconstructive transitionMn3O4 (in 1 term)Mn3O4 -- Jahn–Teller transitionMnO2 (in 1 term)MnO2 -- magnetic transitionN (in 9 terms)N -- imidesN -- hydrogen bond in theoretical organic chemistryN -- dipolar compoundsN -- hydrogen bondN -- umpolung≡N -- nitrilesN -- amidium ionsN -- alkoxyaminesN -- spin crossoverN2 (in 8 terms)N2 -- reference procedure in analysis of trace air constituentsN2 -- cage=N+=N− -- diazo compoundsN2 -- molecular laserN2 -- photochemical nitrogen extrusionN2 -- isoelectronicN2 -- cryogenic samplingN2 -- geminate recombinationN2O (in 1 term)N2O -- local fraction atomizedN3 (in 3 terms)–N=N+=N− -- azidesN3− -- pseudohalogens–N3 -- quinone diazidesN3Na (in 1 term)NaN3 -- azidesNa (in 4 terms)Na+ -- mean activity of an electrolyte in solutionNa+ -- interfering substance in electroanalytical chemistryNa -- resonance lampNa+ -- ionic conductivityNb3Sn (in 1 term)Nb3Sn -- superconducting transitionNe (in 3 terms)Ne -- helium–neon laserNe -- atomic laserNe -- excimer lampNi (in 1 term)63Ni -- electron capture detector in gas chromatographyNiS (in 1 term)NiS -- dilational (dilatational) transitionNO (in 7 terms)NO -- reference procedure in analysis of trace air constituents–NO -- nitroso compoundsNO -- emission in atmospheric chemistryNO -- composition of pure air in atmospheric chemistry–N=O -- isonitroso compoundsNO+ -- isoelectronicNO -- primary pollutant in atmospheric chemistryNO2 (in 8 terms)NO2 -- reference procedure in analysis of trace air constituentsNO2+ -- electrofuge–NO2 -- nitro compoundsNO2 -- π-electron acceptor/donor groupNO2 -- composition of pure air in atmospheric chemistryNO2 -- permeation tubeNO2 -- air pollutantNO2 -- electrophile (electrophilic)NO3 (in 2 terms)NO3− -- mean activity of an electrolyte in solutionNO3 -- oxidant in atmospheric chemistryNO3Rb (in 1 term)RbNO3 -- thermally-induced transitionO (in 20 terms)O -- imides=O -- hydrazidines–O– -- silathianes=O -- characteristic group in organic nomenclature–O– -- imidinesO2− -- ligands=O -- hydroximic acidsO -- dipolar compoundsO -- hydrogen bondO -- tautomerism=O -- diamididesO -- hydrogen bond in theoretical organic chemistry–O– -- silazanes=O -- oxo compoundsO -- umpolungO -- ylidesO -- amidium ions=O -- hydrazones=O -- imidic acidsO -- branching chain reactionO2 (in 14 terms)O2 -- biochemical (biological) oxygen demand(=O)2 -- sulfonediiminesO2 -- singlet molecular oxygen (singlet molecular dioxygen)O2 -- spin-statistical factor (in diffusion-controlled reactions)O2 -- flow rate in flame emission and absorption spectrometryO2 -- mean free pathO22− -- peroxidesO2 -- catalaseO2 -- chemical oxygen demand (COD)O2 -- chemical bondO2 -- Schenck-sensitization mechanismO2 -- Haber–Weiss reactionO2 -- photosynthesisO2 -- configuration (electronic)O2S (in 10 terms)SO2 -- oxidized speciesSO2 -- extraction (equilibrium) constantSO2 -- emission in atmospheric chemistryO2S -- cheletropic reactionSO2 -- primary pollutant in atmospheric chemistrySO2 -- oxidation stateSO2 -- permeation tubeSO2 -- composition of pure air in atmospheric chemistrySO2 -- sink in atmospheric chemistrySO2 -- air pollutantO2Si (in 2 terms)SiO2 -- polymorphic transitionSiO2 -- displacive transitionO2Ti (in 1 term)TiO2 -- irreversible transitionO2V (in 1 term)VO2 -- metal–insulator transitionO2Zr (in 1 term)ZrO2 -- martensitic transitionO3 (in 4 terms)O3 -- reference procedure in analysis of trace air constituentsO3 -- secondary pollution (emissions)O3 -- decay rate in atmospheric chemistryO3 -- greenhouse effect in atmospheric chemistryO3S (in 3 terms)SO3 -- oxidized speciesSO3 -- oxidation state–(SO3−) -- membrane sites in an ion-selective electrodeO3Ti2 (in 1 term)Ti2O3 -- semiconductor-metal transitionO4 (in 1 term)O4 -- chemical bondO4S (in 2 terms)SO42− -- Brønsted baseSO42− -- selectivity coefficientO4S3 (in 1 term)3SO42− -- mean activity of an electrolyte in solutionO4Si (in 1 term)SiO4 -- displacive transitionO5P2 (in 1 term)P2O5 -- electrolytic hygrometerO5V2 (in 1 term)V2O5 -- gelOP (in 1 term)P–O -- ligases (synthetases)P (in 2 terms)P -- imidesP -- umpolungPbS (in 1 term)PbS -- photoconductive detectorPt (in 2 terms)Pt -- pHPt -- gas sensing electrodeS (in 10 terms)S -- polytypic transitionS -- imidesS -- tautomerismS -- mustards–S– -- silathianesS -- hydrogen bond in theoretical organic chemistryS -- umpolungS -- ylidesS -- poison in catalysisS -- triple pointS2 (in 1 term)S2 -- polysulfanesS2Ti (in 1 term)TiS2 -- intercalation reactionS8 (in 1 term)S8 -- oxidation stateSe (in 3 terms)Se -- imidesSe -- umpolungSe -- ylidesSi (in 3 terms)Si -- di-π-silane rearrangementSi -- silanolsSi -- photoconductive detectorSiV3 (in 1 term)V3Si -- superconducting transitionSn (in 2 terms)119Sn -- nuclear quadrupole moment (spectroscopic)119Sn -- quadrupole splitting in Mössbauer spectroscopySZn (in 1 term)ZnS -- polytypic transitionTe (in 2 terms)Te -- imidesTe -- ylidesTi (in 1 term)Ti3+ -- solid state lasersU (in 1 term)239U -- resonance neutronsXe (in 2 terms)Xe -- excimer lampXe -- resonance lampXe2 (in 1 term)Xe2 -- excimer lampZn (in 3 terms)Zn -- polytypic transitionZn -- syntectic reactionZn -- resonance lamp