Three grams (12 millimoles) of p,, p'-dichlorobenzohydrol (prepared by the reduction of p, p- dichlorobenzophenone with zinc and sodium hydroxide') was dissolved in 15 cc. of dry chloroform and 5 cc. of concentrated sulfuric acid was added slowly dropwise with vigorous stirring. After standing at. room temperature for ten minutes the brown mixture was poured onto 50-60 g. of ice. The chloroform layer was separated, washed with 5% sodium ...
