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- W1981967195 abstract "Abstract The results of photolysis of3-O,11-O-diacetyletiojerv-5-ene-3β,11β,20α-triol nitrite (IVb) and the corresponding isomeric 20β-ol nitrite (Vb) are described. It has been found that the products from two isomeric 20-alcohol nitrites are not parallel and the nitrite of the 20α-alcohol affords the products. VII and VIII, arising from hydrogen abstraction from the 18-Me group whereas the nitrite of the corresponding 20β-alcohol gives IX, originating from β-scission, and X arising from hydrogen abstraction from the 15-position of the C-nor-D-homosteroid framework. The pronounced difference in these results from the photolysis of two isomeric nitrites is interpreted in terms of the steric factors involved in the transition states of the two reacting 20-alkoxyl radicals XV and XVI. The structures of VII, VIII, IX and X were clarified mainly spectroscopically. The formation of alkyl nitrate IX in the photolysis of nitrites has never previously been observed. The probable sequences in the formation of the products, VII, IX and X, are discussed." @default.
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- W1981967195 date "1971-01-01" @default.
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- W1981967195 title "Functionalization of 18-methyl group of C-nor-D-homosteroid by the Barton reaction" @default.
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- W1981967195 doi "https://doi.org/10.1016/s0040-4020(01)90696-9" @default.
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