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{"term":{"metadata":{"id":"00964","doi":"10.1351\/goldbook.C00964","code":"C00964","status":"current","longtitle":"IUPAC Gold Book - chair, boat, twist","title":"chair, boat, twist","contexts":[],"contains":"twist form","index":null,"version":"2.3.3","lastupdated":"2014-02-24"},"definitions":{"definition":[{"id":"1","text":"If carbon atoms 1, 2, 4 and 5 of cyclohexane occupy coplanar positions and when carbon atoms 3 and 6 are on opposite sides of the plane the conformation (of symmetry group D3d) is called a chair form. The same term is applied to similar conformations of analogous saturated six-membered ring structures containing hetero-atoms and\/or bearing substituent groups, but these conformations may be distorted from the exact D3d symmetry. For cyclohexane and most such analogues, the chair form is the most stableconformation. If the cyclohexane conformation has no centre of symmetry but possesses two planes of symmetry, one of them bisecting the bonds between atoms 1 and 2 and between 4 and 5 and the other plane passing through atoms 3 and 6 (which lie out of the plane and on the same side of the plane containing 1, 2, 4 and 5), that conformation (of symmetry group C2v ) is called a boat form and it is generally not a stable form. Again, this term is also applied to structural analogues. The conformation of D2 symmetry passed through in the interconversion of two boat forms of cyclohexane is called the twist form (also known as skewboat, skew form and stretched form). [image: Not defined] In a five-membered ring a conformation in which two adjacent atoms are maximally displaced, in opposite directions, relative to the plane containing the other three carbon atoms has been called a half-chair but is better called a twist conformation. In carbohydrate chemistry the term twist refers to a five-membered ring and the D2 symmetry six-membered ring is referred to as skew.","contexts":{"in":[],"of":[]},"chemicals":[{"type":"chemimage","title":"Not defined","file":"C00964-1.png"}],"links":[{"type":"seealso","url":"http:\/\/dev.goldbook.iupac.org\/terms\/view\/H02715"},{"type":"seealso","url":"http:\/\/dev.goldbook.iupac.org\/terms\/view\/E02152"},{"type":"internal","url":"http:\/\/dev.goldbook.iupac.org\/terms\/view\/C01258"},{"type":"goldify","url":"http:\/\/dev.goldbook.iupac.org\/terms\/view\/S05900"},{"type":"goldify","url":"http:\/\/dev.goldbook.iupac.org\/terms\/view\/C01258"},{"type":"goldify","url":"http:\/\/dev.goldbook.iupac.org\/terms\/view\/B00689"},{"type":"goldify","url":"http:\/\/dev.goldbook.iupac.org\/terms\/view\/S05709"},{"type":"goldify","url":"http:\/\/dev.goldbook.iupac.org\/terms\/view\/H02715"}],"math":[],"sources":[]}],"outro":{"html":"In carbohydrate chemistry the term twist refers to a five-membered ring and the D<\/i>2<\/sub> symmetry six-membered ring is referred to as skew<\/a>.","text":"In carbohydrate chemistry the term twist refers to a five-membered ring and the D2 symmetry six-membered ring is referred to as skew."}},"sources":null,"referencedin":[{"title":0,"url":"https:\/\/ru.wikipedia.org\/w\/index.php?title=Конформация&oldid=91679058","source":"wikipedia"}],"links":{"html":"http:\/\/dev.goldbook.iupac.org\/terms\/view\/C00964\/html","json":"http:\/\/dev.goldbook.iupac.org\/terms\/view\/C00964\/json","xml":"http:\/\/dev.goldbook.iupac.org\/terms\/view\/C00964\/xml","plain":"http:\/\/dev.goldbook.iupac.org\/terms\/view\/C00964\/plain","pdf":"http:\/\/dev.goldbook.iupac.org\/terms\/view\/C00964\/pdf","originalpdf":"http:\/\/iupac.org\/goldbook\/C00964.pdf"},"citeas":"IUPAC. Compendium of Chemical Terminology, 2nd ed. (the \"Gold Book\"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http:\/\/goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https:\/\/doi.org\/10.1351\/goldbook.","license":"Licensed under Creative Commons Attribution-NoDerivatives (CC-BY-ND) 4.0 International (https:\/\/creativecommons.org\/licenses\/by-nd\/4.0\/)","disclaimer":"The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.","accessed":"2021-09-24T09:17:46+00:00"}}