T. Suzuki et al., GENERAL-METHOD FOR DETERMINATION OF CONFIGURATION OF STEROID-17-YL METHYL GLYCOLATES AT C-20, Chemical and Pharmaceutical Bulletin, 41(8), 1993, pp. 1481-1483
Kinetic examination for methoxycarbonylations of the isomeric steroid-
17-yl methyl glycolates at C-20 and plots of the amount of each isomer
produced by a reaction of their corresponding steroids with cupric ac
etate in absolute methanol provide a general and facile method for det
ermination of the configuration of the steroid-17-yl methyl glycolates
at C-20.