The photochemical hypoiodination of cortisol acetonide gave a mixture
of 18-iodocortisol acetonide and of the 11 beta,19-oxidoderivative. Th
e proportion of the two products was slightly modified by the reaction
temperature. Deprotection of the acetonide group of the 11 beta,19-ox
idoderivative gave 11 beta,19-oxido-17 alpha,21-dihydroxy-4-pregnen-3,
20-dione which led to the formation of 11 beta,19-oxido-4-androsten-3,
17-dione upon treatment with sodium bismutate.