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Characterization of Small Azocrown Ether Stereoisomers

Luboch E., Wagner-Wysiecka E., Kravtsov V., Kessler V.

Polish Journal of Chemistry

2003

Vol. 77 / nr 2

189-196

The stable E- and Z-isomers of 10-membered azocrown ether have been isolated and studied by X-ray, 1H NMR and UV-Vis methods. Their structures in a solid state indicate the stretched conformation for trans-isomer and unstressed for cis-isomer. The concerted effect of azo-group _-conjugation with benzene residue and steric strain of molecular conformation results in the observed stability of isomers.