Crystal Structure of ent-7α, 18-Diacetoxykaur-16-ene (Epicandicandioldiacetate)

Abstract

The title compound (C 24 H 36 O 4 ) crystallizes in the orthorhombic space group P2 1 2 1 2 with a=6.250(1) A, b=13.676(1) A, c=25.419(2) A, V=2172.7(1) A 3 , Z=4, D x =1.19 g.cm -3 . The structure was solved by direct methods and refined by full-matrix least-squares method (R=0.076). The title molecule is an entkaurene diterpene containing two acetoxy groups at positions C7 and C18, The ring junction A-B is in trans, while B-C is in cis, The rings A and B have chair conformations, while ring C has a twist conformation but the conformation of ring D is nearer to an envelope.