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DPNH as hydrogen donor for ring A reduction of Δ4-3-ketosteroids

✍ Scribed by K. Leybold; Hj. Staudinger

Book ID
118843908
Publisher
Elsevier Science
Year
1962
Tongue
English
Weight
227 KB
Volume
96
Category
Article
ISSN
0003-9861

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On the basis of a PMR study, we previously reported that the B-ring in seveml A'-3-ketostemids having a +substituent bulkier than or equal in size to chlorine is distorted owing to the 1,3-dioxial intern&on between the IO-methyl group and the q-substituent (1). However, scme reservation about this c

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DJERASSI, et al. (1) have pointed out that the optical rotatory dispersion (ORD) curve in substituted-A 4 -3-ketosteroids reflects conformational distortions in the B-ring rather than in the A-ring. Their conclusion is based on the observation that 17@-acetoxyandrost-4-en-3-one and its 2,2-dimethyl