possession of more than one structure by a substance
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• (n.) The condition, quality, or relation of metameric substances, or their respective derivatives, which are more or less interchangeable, according as one form or the other is the more stable. It is a special case of metamerism; thus, the lactam and the lactim compounds exhibit tautomerism.
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the existence of two or more chemical compounds that are capable of facile interconversion, in many cases merely exchanging a hydrogen atom between ... [3 related articles]
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Isomerism of the general form G-X-Y=Z X=Y-Z-G where the isomers (called tautomers) are readily interconvertible; the atoms connecting the groups X,Y,Z are typically any of C, H, O, or S, and G is a group which becomes an electrofuge or nucleofuge during isomerization. The commonest case, when the electrofuge is H
+, is also known as 'prot...
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<chemistry> The condition, quality, or relation of metameric substances, or their respective derivatives, which are more or less interchangeable, according as one form or the other is the more stable. It is a special case of metamerism; thus, the lactam and the lactim compounds exhibit tautomerism. ... Origin: Gr., for the same + part. ... So...
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(taw-tom´әr-iz-әm) stereoisomerism in which the compounds are mutually interconvertible, under normal conditions, forming a mixture that is in dynamic equilibration. adj., tautomer´ic., adj.
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Form of isomerism in which there are two or more arrangements usually of hydrogens bonded to oxygen. Keto-enol tautomerism is one common example. The balance between two coexisting tautomers may shift with time or as a result of changes in conditions.
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Tau·tom'er·ism noun [ Greek ...; ..., for ... ... the same + ... part.]
(Chemistry) The condition, quality, or relation of metameric substances, or their respective derivatives, which are more or less interchangeable, according as one form or the other is the more stable. It is a special case of m...
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Type: Term Pronunciation: taw-tom′ĕr-izm Definitions: 1. A phenomenon in which a chemical compound exists in two forms of different structure (isomers) in equilibrium, the two forms differing, usually, in the position of a hydrogen atom; keto-enol tautomerism, R-CH
2-C(O)-R′ ⇄ R-CH=C(OH)-R′. ...
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tautomerism 1. Chemical isomerism in which the isomeric forms differ little, usually only in the position of a hydrogen atom, and are able to exist in equilibrium and react with each other. 2. The relationship that exists between two structural isomers that are in chemical equilibrium and freely change from one form to the other.
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