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Deuterium isotope effects in solutions of 2,4-pentanedione

✍ Scribed by Thomas K. Leipert

Publisher
John Wiley and Sons
Year
1977
Tongue
English
Weight
265 KB
Volume
9
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Proton and deuterium n.m.r. measurements in acetylacetone and 3,3‐d~2~‐acetylacetone are reported. Deuterium‐isotope effects on chemical shifts and keto–enol equilibria as a function of concentration in the two solvents triethylamine and pyrrole are determined. A strong solvent concentration dependence for d‐isotope effects is observed in triethylamine; in pyrrole no dependence is obtained. The results are interpreted in terms of an equilibrium between the symmetrical (C~2v~) and asymmetrical (C~s~) enolic forms in acetylacetone. The usefulness of ^2^H n.m.r. for the study of exchange processes is demonstrated.

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