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E–Z isomerism of anilinomethylenemalonic acid derivatives

✍ Scribed by C. Bünz; D. Heber; U. Holzgrabe; U. Sürig

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
319 KB
Volume
31
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The temperature and concentration dependence of the ^1^H NMR spectra of four anilinomethylenemalonic acid derivatives were determined in CDCl~3~ and DMSO‐d~6~ to assign the E–Z isomers and to investigate the formation of intra‐ and intermolecular hydrogen bonds. Chemical shifts and coupling constants in the ^13^C NMR spectra correspond with the results of the ^1^H NMR investigations in the case of the cyanoacetate ester derivative. Contradictory results for the acetoacetate derivative were found by semi‐empirical calculations.

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