New preparative methods using triphenylphosphine-diethyl- azodicarboxylatehydroxycompound.-Szcmnzuvy. The present paper deals with new preparative methods by lvhich thc system of triphenylpliosphinc-dicthylazodicarboxylate- hydroxycompound is treated with inany nucleophilcs. On one side, the transformation of 5 a- cholestanc-3/1-01 to the 3 cr-sub-stitutcd derivatives 2a-2e (Scheme I) by hitherto ...
