The reinvestigation of the n-BuOH extract of the roots of Clematis argentilucida led to the isolation of four new oleanane-type triterpenoid saponins, 1-4, four known saponins, 5-8, first isolated from the species, together with ten saponins, 9-18, reported in the preceding papers. The structures of saponins 1-8 were elucidated by extensive spectroscopic analysis and chemical evidences. The cyt...

The structures of cyanogen and diacetylene have been previously investigated by the electron-diffraction method by Wierl,I who reported nonlinear models with 1500 bond angles for both molecules. The improbability of this conclusion, which is incompatible with all other evidence for the angle between a triple and a single bond on the same carbon atom, led to a reinvestigation of these compounds ...