[CH3:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[C:8](=[CH:13][O:14][CH3:15])[C:9]([O:11][CH3:12])=[O:10].[Br:16]N1C(=O)CCC1=O.N(C(C)(C)C#N)=NC(C)(C)C#N.C1(=O)NC(=O)CC1>C(Cl)(Cl)(Cl)Cl>[Br:16][CH2:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[C:8](=[CH:13][O:14][CH3:15])[C:9]([O:11][CH3:12])=[O:10]20.6 g of the methyl α-(2-methylphenyl)-β-methoxyacrylate obtained by Method A, 17.65 g of N-bromosuccinimide, 0.2 g of azodiisobutyronitrile and 150 ml of CCl4 are slowly heated to 90° C. This temperature is maintained until all the succinimide is floating on the solvent. Filtration is followed by concentrating, the remaining oil is dissolved in about 5 ml of acetone, and n-hexane is added to bring about crystallization. This gives 27.5 g of colorless crystals of mp 86°-87° C.
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