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
3α-(二甲基苯基甲硅烷氧基)-5α-雄甾烷-11,17-二酮 (1) 在乙腈和三乙胺中的光解,使用二甲基苯基甲硅烷氧基 (DPS) 发色团吸收的 266 nm 光,导致 C17 酮基团的主要还原光反应。这与酮部分在 308 nm 光下的直接光解形成对比,其中环 D 的差向异构化是主要结果,还原最小。使用 cis-1,3-pentadiene 进行的三重猝灭研究证实还原来自 C17 酮三重态,而差向异构化源于 C17 激发单重态