Bp. Pradhan et al., STUDIES ON OXIDATION OF TRITERPENOIDS .18. OXIDATION OF FRIEDELIN OXIME AND CERIN OXIME WITH SELENIUM DIOXIDE IN DIOXAN, Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 34(4), 1995, pp. 280-284
Friedelin oxime (1) on prolonged heating with selenium dioxide in diox
an furnishes three products identified as 2-keto-friedel-3(4)-en-3-azo
-23-N-selenide (2), friedel-1(10),4(23)-dien-3-nitroso-O-23-selenoxide
(3) and 2-keto-3-oximino friedel-1-selenoxide (4) while similar react
ion on cerin oxime (5) affords a single compounds 3.