1: 68 percent / N-bromosuccinimide / H2O; acetone / 1.) 0 deg C, 2.) from 0 deg C to room temp., 1 h 2: 93 percent / BBr3 / CH2Cl2 / 7 h / -50 °C View Scheme

Celite; silver carbonate; triethylamine in dichloromethane 0.0833333 h;