[Br:1][C:2]1[CH:10]=[CH:9][C:5]([C:6](Cl)=O)=[CH:4][CH:3]=1.[Br:11][C:12]1[CH:19]=[CH:18][C:15]([CH:16]=C)=[CH:14][CH:13]=1.C(N(C)C)C1C=CC=CC=1>C([O-])(=O)C.[Pd+2].C([O-])(=O)C.CC1C=CC=CC=1C>[Br:1][C:2]1[CH:10]=[CH:9][C:5]([CH:6]=[CH:16][C:15]2[CH:18]=[CH:19][C:12]([Br:11])=[CH:13][CH:14]=2)=[CH:4][CH:3]=10.112 mg (0.5 millimols) of palladium acetate, 10.97 g (50 millimols) of 4-bromobenzoyl chloride, 10.17 g (50 millimols) of 4-bromostyrene and 6.76 g (50 millimols) of N-benzyldimethylamine in 100 m of o-xylene are stirred for 1 hour at 130° C. After having filtered off the amine salt which has precipitated, the filtrate is concentrated and the crude product is recrystallised twice from toluene. 7.8 g (46% of theory) of 4,4'-dibromostilbene are obtained in the form of white flakes; melting point 213.3° C.
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