[Mg].Br[C:3]1[CH:4]=[C:5]([Cl:9])[CH:6]=[CH:7][CH:8]=1.[C:10](#N)[C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1.S(=O)(=O)(O)[OH:19]>O1CCCC1>[Cl:9][C:5]1[CH:4]=[C:3]([CH:8]=[CH:7][CH:6]=1)[C:10]([C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1)=[O:19]To a suspension of 6.4 g. (0.266 mole) of magnesium turnings in 50 ml. of tetrahydrofuran was added dropwise 51 g. (0.268 mole) of 3-bromochlorobenzene in 100 ml. of dried tetrahydrofuran and the mixture refluxed for one hour. The cooled reaction mixture was added to 27.4 g. (0.266 mole) of benzonitrile in 100 ml. of tetrahydrofuran and refluxed for one hour. The reaction mixture was poured carefully into 100 ml. of ice/water and 10 ml. of concentrated sulfuric acid and heated on a steam bath for 30 minutes. The solution was cooled, extracted with ether, washed with water and 5% sodium bicarbonate solution, dried, evaporated and chromatographed to give 3-chlorobenzophenone (recrystallized from methanol), m.p. 83° C.
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