Abstract: The NMR spectra of oleanane type triterpenoids, glyyunnansapogenins (I-IX) have been investigated. The assignments of the ¹³C-NMR signals have been made by using PBB, INEPT, DEPT methods and the known chemical shift rules. It was found that the oxygenated substitute at the angular methyl group can be easily recognized by inspecting the chemical shifts of the angular methyl groups, and the effects of oxygenated substitutes to the rings are also analyzed. In the assignments of the ¹³C-NMR signals of olean-11,13 (18)-diene compounds, the junction between D and E ring is considered to be the same as that of 18α-H olean-12-en, compounds. The known chemical shift rules used to the olean-12-en, 11-oxo, 30(or 29) →18β (or 18α) lactone arc also discussed. Another regular chemical shift for the oleanane compounds with one OAc group subsitituted in D or E ring has also been found.

Key words: NMR, Glyyunnansapogenin, Pcntacyclic triterpenodis of oleanane