The constitution of the β,γ-unsaturated lactone C31H44O5 obtained by oxidation of methyl oleana-11,13(18)-dien-28-oate
Abstract
The n.m.r. spectrum of the β,γ-unsaturated lactone, prepared by the oxidation of methyl oleana-11,13(18)-dien-28-oate, supports the structure assigned by Spring et al., J. Chem. Soc., 1954, 1989; 1956, 1949, to the corresponding oxidation products derived from other triterpenes of the oleanane group.