N-bromosuccinmide; dibenzoyl peroxide in tetrachloromethane 5 h; Heating;

1: 1.) Mg / 1.) iodine / 1.) ether, reflux, 20 h; 2.) ether, r.t., 2 h 2: 81 percent / 50percent sodium hydride (oil dispersion) / benzene; dimethylformamide / 4 h / Heating 3: 1.) ethyl chloroformate; 2.) 50percent KOH / 1.) benzene, reflux, 24 h; 2.) ethanol, reflux, 18 h View Scheme