Abstract

A study of the circular dichroism characteristics of various 16-substituted 20-keto pregnane and isopregnane derivatives has been made. The curves of the 16,17- trans compounds are simila to those of the 16-unsubstituted parent compounds. Modifications of functions in rings A and B have little effect, if any, on the circular dichroism maxima around 290 mμ. In the case of 16,17- cis compounds, both the configuration and the nature of the 16-substituent have an important bearing on the sign and intensity of the Cotton effect associated with the 17-acetyl side chain. The circular dichroism data for 16,17-epoxy-20-keto steroids are discussed.

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