tautomerism


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tautomerism

 [taw-tom´er-izm]
stereoisomerism in which the compounds are mutually interconvertible, under normal conditions, forming a mixture that is in dynamic equilibration. adj., adj tautomer´ic.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

tau·tom·er·ism

(taw-tom'ĕr-izm),
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; for example, keto-enol tautomerism, R-CH2-C(O)-R' ⇄ R-CH=C(OH)-R'.
[G. tautos, the same, + meros, part]
Farlex Partner Medical Dictionary © Farlex 2012

tau·tom·er·ism

(taw-tom'ĕr-izm)
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.
[G. tautos, the same, + meros, part]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
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References in periodicals archive ?
Dziembowska et al., "Keto-enol tautomerism of two structurally related Schiff bases: Direct and indirect way of creation of the excited keto tautomer," Chemical Physics Letters, vol.
OH) during tautomerism and thereby contributing to decrease in electron density around the proton.
Raman-spectra of polypeptides containing L-histidine residues and tautomerism of imidazole side-chain.
Also, it was clear from the redox potentials of the two monosaccharides studied that their reducing power was close to each other, and it could be explained as follows: although D-fructose would appear to be nonreducing, it readily undergoes keto-enol tautomerism at high pH to form a mixture of D-glucose and D-mannose.
Katritzky, "Tautomerism of heterocycles: condensed five-six, five-five, and six-six ring systems with heteroatoms in both rings," Advances in Heterocyclic Chemistry, vol.
In acid solutions, 5-oxoacid undergoes keto-enol tautomerism (Scheme 3).
There might be differences in these orders due to forming intermolecular hydrogen bonding and forming acid thiol and enol group because of tautomerism in the ligand.
This could be due to intramolecular electron transfer via valence tautomerism between electroactive ligand and metal ion [23-26] causing fast disproportionation of Cu(I) complex to give Cu(II) or some rearrangement within complex so as to give a more stabilized species.
Bernat et al., "Stereochemistry, tautomerism, and reactions of acridinyl thiosemicarbazides in the synthesis of 1,3-thiazolidines," Journal of Heterocyclic Chemistry, vol.