carbene analogues

https://doi.org/10.1351/goldbook.C00807
The electrically neutral mononuclear hydrides of group 14 having two non-bonding electrons, the electrically neutral mononuclear hydrides of group 15 having four non-bonding electrons, and also the compound HB:. The names of a number of these are shown below.
RB: boranylidenesRAs: arsanylidenesRN: nitrenes
R2Sn: stannylidenesR2Si: silylenesRSb: stibanylidenes
RP: phosphanylidenesR2Pb: plumbylidenesR2Ge: germylidenes
Note that if R = H, these compounds are parent hydrides; derivatives formed by substitution are named accordingly. However, if the substituent's first atom, bearing the free @V06588@, is of the same element as the atom of the carbene analogue, other parent compounds may be required (see @C00806@), e.g. HN: nitrene; CH3N: methylnitrene; H2NN:@D01686@ (synonym @I03273@, not @A00280@).
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1324 [Terms] [Paper]