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A 1H NMR study of tautomerism in some 1-arylamino-3-aryliminopropenes

✍ Scribed by C. P. Richards; G. A. Webb

Publisher
John Wiley and Sons
Year
1976
Tongue
English
Weight
288 KB
Volume
8
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

^1^H n.m.r. spectra at ambient temperatures reveal that an equilibrium exists between the ‘all‐trans’ and ‘all‐cis’ isomers of some of the 1‐arylamino‐3‐aryliminopropenes. The ‘all‐cis’ isomer predominates in nonpolar solvents, whereas the ‘all‐trans’ isomer is favoured in hydrogen bonding solvents. From a consideration of the magnitudes of the ^3^J coupling constants, it is reported that the ‘cis‐trans’ isomer is the most stable form of the 4‐nitrophenyl derivative in dimethyl sulphoxide.

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