Method of attachment of a group dihalomethylene on a double the? is combined with a keto - steroid and steroids obtained1,163,736. Dihalomethylene-substituted steroids. SYNTEX CORP. 8 Sept., 1966 [9 Sept., 1965; 20 Oct., 1965 (2); 22 Oct., 1965 (2)], No. 40196/66. Heading ...