hydrogenchloride; 1,3-dibromo-5,5-dimethyl-hydantoin; 2,2'-azo-bisisobutyronitrile 1.) CCl4, reflux, 2 h, 2.) THF, overnight; Yield given. Multistep reaction. Yields of byproduct given;

pyridine; p-toluenesulfonyl chloride in toluene 10 h; Heating;