Organic photochemistry. 95. Antenna-initiated photochemistry of distal groups in polyfunctional steroids. Intramolecular singlet and triplet energy transfer in 3.alpha.-(dimethylphenylsiloxy)-5.alpha.-androstan-17-one and 3.alpha.-(dimethylphenylsiloxy)-5.alpha.-androstane-11,17-dione
作者:Zheng Zhi Wu、Harry Morrison
DOI:10.1021/ja00037a013
日期:1992.5
Photolysis of 3α-(dimethylphenylsiloxy)-5α-androstane-11,17-dione (1) in acetonitrile with triethylamine, using 266-nm light absorbed by the dimethylphenylsiloxy (DPS) chromophore, leads to reduction of the C17 keto group as the principal photoreaction. This contrasts with the direct photolysis of the ketone moieties with 308-nm light, wherein epimerization of ring D is the major consequence and reduction