REACTION OF 3β-ACETOXY-5β, 6β-EPOXIDE-6α-METHYL-25D SPIROSTANE(Ⅲ) WITH BORON TRIFLUORIDE ETHERATE
CHOW WE1-ZAN, CHU WEI-SHANG, HUANG MINLON
Acta Chimica Sinica . 1963, (5): 364 -367 .