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NMR study of the influence of β-substituents on the intramolecular hydrogen bond in β-dicarbonyl compounds

✍ Scribed by N. N. Shape'ko

Publisher
John Wiley and Sons
Year
1973
Tongue
English
Weight
258 KB
Volume
5
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The hydroxyl proton chemical shifts of β‐dicarbonyl compounds involving various β‐substituents have been studied. An additive influence of β‐substituents on the δ~OH~ shift values has been found. The results obtained suggested the existence of only one potential proton energy minimum in the intramolecular hydrogen bond of the enol forms of the β‐diketones. It has been shown that the enol forms of β‐keto esters do not follow the additivity of the δ~OH~ values for the same substituents, which may be due to a change in the proton distribution potential function in the intramolecular hydrogen bond.

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