title: Triterpenoide. XX. 3beta-acetoxy-12-oxo-18beta-olean- und 3beta-acetoxy-12,19-dioxo-9(11), 13(18)-oleandien-28-saure-methylester
abstract: The structures of methyl 3beta-acetoxy-12-oxo-18beta-olean-28-oate [C(33)H(52)O(5), (I)] and methyl 3beta-acetoxy-12, 19-dioxoolean-9(11),13(18)-dien-28-oate [C(33)H(46)O(6), (II)] are described. In (I), all rings are in the chair conformation, rings D and E are cis and the other rings trans-fused. In compound (II), only rings A and E are in the chair conformation, ring B has a distorted chair conformation, ring C a distorted half-boat and ring D an insignificantly distorted half-chair conformation.
authors.affiliation: Lehrstuhl fur Organische Chemie der K. Marcinkowski Universitat der Medizinischen Wissenschaften Poznan, ul. Grunwaldzka 6, 60-780 Poznan, Polen. akgzella@eucalyptus.usoms.poznan.pl.
authors.initials: A
authors.lastname: Gzella