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The oxidative decarboxylation of betulonic, 3,20-dioxo-29- nor-lupan-28-oic, dihydrobetulonic acids with Pb(OAc) 4  in the presence of Py, Cu(OAc) 2 , CF 3 COOH or with PhI(OAc) 2  – I 2  leads to 28- nor-lup-16(17)-enes and 28- nor-lup-17(22)-enes, and 17α-acetoxy derivatives. The proportion of regioisomeric olefines is related to a substituent at C-19; the yields of olefines and of acetoxy derivatives depends on reaction conditions and structures of the starting acids. The structures of products were determined by spectroscopic methods.

Oxidative Decarboxylation of Triterpene C-28 Acids of Lupane Series