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1H and 13C NMR study of stereoisomers of 3-(arylpropenylidene)isobenzofuran-1(3H)-ones

✍ Scribed by Nikolay N. Sveshnikov; Victor I. Nikulin

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
269 KB
Volume
33
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

A study of the ^1^H and ^13^C NMR spectra of a series of E,E‐ and Z,E‐isomers of 3‐(arylpropenylidene)isobenzofuran‐1 (3__H__)‐ones [1a–d and 2a–d, respectively] was carried out. The E,E‐ and Z,E‐isomers 1a–d and 2a–d were recognized by the local anisotropy effect of the double and triple bonds of the substituents experienced by H‐4 in E,E‐isomers; in Z,E‐isomers; in contrast to their E,E‐analogues, upfield shifts of C‐4 and C‐8 due to the HH γ‐cis effect were observed.

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