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L. (1965). Keto-enol tautomerism in β-dicarbonyls studied by nuclear magnetic resonance spectroscopy: II. Solvent effects on proton chemical shifts and on equilibrium constants. Canadian Journal of Chemistry, 43(5), 1516-1526. https://doi.org/10.1139/v65-202...
These shifts are discussed in terms of the dissociation of ... MT Rogers,JL Burdett - 《Revue Canadienne De Chimie》 被引量: 146发表: 1965年 Keto-enol tautomerism. Relative stabilization of enol isomers Ab initio molecular orbital theory is used to examine the effect of simple π-electron-...
The enol-keto tautomerism of N-(2-hydroxy-1-naphthylidene)anilines was studied. In response to the action of salts (e.g. CaCl2), in ethanolic solution the equilibrium is shifted extensively in the direction of the keto form; this allows determination of the concentration of the keto form ...
To determine which compound among the given options does not show keto-enol tautomerism, we need to analyze the presence of alpha-hydrogens in each compound. Keto-enol tautomerism occurs when there is an alpha-hydrogen available for the tautomerizatio
L. (1965). Keto-enol tautomerism in β-dicarbonyls studied by nuclear magnetic resonance spectroscopy: II. Solvent effects on proton chemical shifts and on equilibrium constants. Canadian Journal of Chemistry, 43(5), 1516-1526. https://doi.org/10.1139/v65-202...
The tautomerism of curcumin (CUR) in aqueous solution was investigated in the presence of silver nanoparticles (AgNPs) in the temperature range 294-314 K. The kinetic data indicate that the conversion of the keto-enol into the diketo form is associated to higher rate constants in comparison to...
A base-catalyzed keto-enol tautomerism is proposed to be responsible for the observed deuterium exchange. This finding has been applied to the preparation of tritium-labeled diazepam in which only aromatic protons are labeled with tritium atoms. A tritium-labeled diazepam lacking tritium atoms at 1...
Keto–enol tautomerism in crystals of 3-[hydroxy(phenyl)methyl]-2,5,7 trimethyl-2,3-dihydropyrido[3,2-e]-[1, 2]thiazin-4-one 1,1-dioxide and 3-(1-hydroxyethylidene)-2,5,7-trimethyl-2,3-dihydropyrido[3,2-e][1, 2]-thiazin-4-one 1,1-dioxide. Acta Crystallogr. 2008;C64:...
The main conversions of 伪-ketol fatty acids (18:2 and 18:3), accompanying their redox interactions with 2,6-dichlorophenolindophenol (DCPIP) and copper(II) acetate, were studied. The highest rates of oxidation with DCPIP were observed in the alkaline water solutions. In the acidic aqueous ...