| abstract |
1,145,648. Pregnane derivatives. F. HOFF. MANN-LA ROCHE & CO. A.G. 12 Aug., 1966 [28 Jan., 1966], No. 40677/68. Divided out of 1,145,641. Heading C2U. Novel pregnane derivatives of the general formula wherein R<SP>1</SP> and R<SP>2</SP> each represent an acetoxy group and R<SP>3</SP> represents a grouping of the formula are prepared by treating a pregnane of the general formula wherein R<SP>1</SP>, R<SP>2</SP> and R<SP>3</SP> have the same meaning as above with bromine, suitably in the presence of glacial acetic acid. |