tautomer

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tautomer

The Columbia Encyclopedia, Sixth Edition | 2008 | The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press. (Hide copyright information) Copyright

tautomer , one of two or more structural isomers that exist in equilibrium and are readily converted from one isomeric form to another. Of the various types of tautomerism that are possible, two are commonly observed. In keto-enol tautomerism a simultaneous shift of electrons and a hydrogen atom occurs; it was first observed by K. Meyer in the ethyl ester of 3-oxobutanoic acid (ethyl acetoacetate), which occurs naturally as a mixture of the two forms. Ring-chain tautomerism, first recognized by Emil Fischer, is exhibited by glucose. It arises as a result of the aldehyde group (-CHO) in a sugar chain molecule reacting with one of the hydroxy groups (-OH) in the same molecule to give it a cyclic (ring-shaped) form.

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tautomer

The Oxford Pocket Dictionary of Current English | 2009 | © The Oxford Pocket Dictionary of Current English 2009, originally published by Oxford University Press 2009. (Hide copyright information) Copyright

tau·to·mer / ˈtôtəmər/ • n. Chem. each of two or more isomers of a compound that exist together in equilibrium, and are readily interchanged by migration of an atom or group within the molecule. DERIVATIVES: tau·to·mer·ic / ˌtôtəˈmerik/ adj. tau·tom·er·ism / tôˈtäməˌrizəm/ n.

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Free Article 3-substituted 1,2-benzisothiazole-1,1-dioxides/beta-ketoesters: multiple anion synthesis and characterization.(SOUTH CAROLINA ACADEMY OF SCIENCE ABSTRACTS)
Magazine article from: Bulletin of the South Carolina Academy of Science; 1/1/2005
Free Article Reducing slag-related defects in cast iron. (part 2 of 4)
Magazine article from: Modern Casting; 8/1/1993

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3-substituted 1,2-benzisothiazole-1,1-dioxides/beta-ketoesters: multiple anion synthesis and characterization.(SOUTH CAROLINA ACADEMY OF SCIENCE ABSTRACTS)
Magazine article from: Bulletin of the South Carolina Academy of Science; 1/1/2005; ; 284 words ; ...aminosulfonyl)benzoate, only a single tautomer resulted after recrystallization from...involving saccharin also gave the same tautomer, but only after several recrystallizations...deuteriochloroform, a consistent single tautomer was obtained, whose structure was further... Read more
Reducing slag-related defects in cast iron. (part 2 of 4)
Magazine article from: Modern Casting; 8/1/1993; ; 700+ words ; ...amounts of ladle slag are formed. As expected, it validated the well-known reaction between Mn and S in cast iron: Mn + FeS |tautomer~ MnS + Fe. These tests concluded that low pouring temperatures caused these types of blowholes, and, at a given S level, blowholes... Read more
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