[CH:1]([C:4]([C:6]1[CH:11]=[CH:10][C:9]([Cl:12])=[CH:8][CH:7]=1)=[O:5])([CH3:3])[CH3:2].[OH-].[K+].[Cl:15][C:16]1[CH:23]=[CH:22][C:19]([CH2:20]Cl)=[CH:18][CH:17]=1>[Br-].C([N+](CCCC)(CCCC)CCCC)CCC.C1(C)C=CC=CC=1>[Cl:15][C:16]1[CH:23]=[CH:22][C:19]([CH2:20][C:1]([C:4]([C:6]2[CH:7]=[CH:8][C:9]([Cl:12])=[CH:10][CH:11]=2)=[O:5])([CH3:3])[CH3:2])=[CH:18][CH:17]=185 g (0.466 mol) of 4-chlorophenyl isopropyl ketone, 31.3 g (0.56 mol) of potassium hydroxide and 5 g of tetrabutylammonium bromide in 120 ml of toluene are heated to the reflux temperature, and a solution of 75 g (0.466 mol) of 4-chlorobenzyl chloride in 60 ml of toluene is added dropwise. The reaction mixture is subsequently stirred under reflux for 12 hours, cooled and washed with water and the organic phase is dried over sodium sulphate and concentrated in vacuo. 81.5 g (60% of theory) of 4-chlorophenyl 4-chlorophenyl-tert.-butyl ketone of refractive index nD20 1.5711 are obtained.
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