1: 86 percent / silver perchlorate / acetone / 1.) room temp. 50 min; 2.) 50 deg C, 1 h 2: 90 percent / silver acetate, glacialacetic acid, zinc / methanol / 2 h / Heating View Scheme

With  N-bromosuccinmide; dibenzoyl peroxide in  tetrachloromethane 3 h;  Heating;   

Multi-step reaction with 2 steps 1: 78 percent / methanol; diethyl ether2: 51 percent / benzoyl peroxide, N-bromosuccinimide / CCl4 / 3 h / Heating  

With  silver perchlorate in  acetone  1.) room temp. 50 min; 2.) 50 deg C, 1 h;