A One- and Two-Dimensional ¹H and ¹³C N.M.R. Study of Some Fernene Triterpenoids

Abstract

A complete assignment of the ¹H and ¹³C n.m.r. signals of the lichen triterpenoid 12α-acetoxyfern-9(11)-en-3 β-ol (lb) has been achieved by using one- and two-dimensional n.m.r. techniques. Evidence in support of one of two recently advanced assignments of the methyl group resonances of fern-9(11)-en-3-β-ol (1a) is presented.