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■ Preparation and Spectroscopic Properties of Trichotomine Derivatives Bearing Sterically Hindered Acyl Groups on C-1 and -1'

Hajime Irikawa* and Yasuhiro Kobayashi

*Department of Chemisttry, Faculty of Science, Shizuoka University, Ohya, Shizuoka 422

Abstract

The absorption and ¹³C NMR spectra of 1,1’-diacyltrichotomine derivatives showed that the central C(2)=C(2’) double bond was twisted, and coplanarity of the 1,1’-diacyl groups and the trichotomine chromophore was hindered by steric interactions between the 1,1’-diacyl groups and the 3,3’-dicarbonyl groups.