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Communication | Regular issue | Vol 19, No. 2, 1982, pp.213-215
Published online, 1st January, 1970
DOI: 10.3987/R-1982-02-0213
Photochamical cis, trans-Isomerization in the 2,3-Diphenylpiperazine Series

L. Benadjila-Iguersira, J. Chastanet, and G. Roussi

*Institut de Chimie des Substances Naturelles, Centre National de la Recherche Scientifique, Avenue de la Terrasse, Bat. 27, 91198 Gif-sur-Yvette Cedex, France

Abstract

Irradiation of cis diphenyl substituted piperazines 2a, b (R = Me, H) in acetonitrile solution results in their conversion to trans compounds 1a, b (R = Me, H) while in the case of 2C (R = CH2ø) no isomerization is observed. On the other hand, none of the three trans-piperazines isomerizes under the same conditions. A general mechanism is proposed.