Mass spectrometry in structural and stereochemical problems. 257. Effect of additional double bonds on the mass spectrometric fragmentations of .DELTA.4-3-keto steroids
作者:Frederick J. Brown、Carl Djerassi
DOI:10.1021/jo00318a022
日期:1981.2
US4100026A
申请人:——
公开号:US4100026A
公开(公告)日:1978-07-11
Process for the preparation of 4-androstene-3,17-dione derivatives
申请人:Schering Aktiengesellschaft
公开号:US04100026A1
公开(公告)日:1978-07-11
A process for the preparation of 4-androstene-3,17-dione derivatives of the formula ##STR1## wherein X is 1,2-methylene or 1- or 2-methyl, comprises fermenting a sterol derivative of the formula ##STR2## wherein X is as above, the bond is a single or double bond, and R.sub.1 is the hydrocarbon residue, of 8-10 carbon atoms, of a sterol, with a microorganism culture capable of the side chain degradation of sterols.