Structure of crotepoxide: X-ray analysis of crotepoxide iodohydrin

Abstract

X-Ray crystal-structure analysis of crotepoxide iodohydrin has defined the constitution and absolute stereochemistry of crotepoxide, a novel tumour-inhibiting cyclohexane diepoxide derivative isolated from Croton macrostachys. Crystals of the iodohydrin are monoclinic, space group P2₁, with Z= 2, and unit-cell dimensions a= 5·21, b= 15·85, c= 12·18 Å, β= 100° 42′. The atomic co-ordinates were determined by Fourier and least-squares calculations, and the final value of R was 12·2% for 1166 independent reflexions. The cyclohexene oxide ring displays a half-chair conformation.