Carbon- 13 n.m.r. spectra of cardenolide glycosides. Configuration of the 11,12-epoxide in cerbertin
Abstract
The 13C n.m.r. data of the Digitalis and the Cerbera cardiac glycosides, and of ouabain and neriifolin, have been analysed. Both 13C and 1H n.m.r. results show that the 11,12-epoxide in cerbertin has an α-configuration.