[C:1]([OH:11])(=[O:10])[CH2:2][CH2:3][C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1.[Br:12]N1C(=O)CCC1=O.C(OOC(=O)C1C=CC=CC=1)(=O)C1C=CC=CC=1.C1(=O)NC(=O)CC1>C(Cl)(Cl)(Cl)Cl.O>[Br:12][CH:3]([C:4]1[CH:5]=[CH:6][CH:7]=[CH:8][CH:9]=1)[CH2:2][C:1]([OH:11])=[O:10]A mixture of 100 g (0.667 mol) of hydrocinnamic acid, 120 g (0.674 mol) of N-bromosuccinimide, and 1.8 g of benzoyl peroxide (BPO) in 900 ml of CCl4 was heated at reflux for 20 hr under nitrogen. After cooling to room temperature the reaction mixture was filtered. The filtrate when stripped to dryness yielded only a small amount of additional material which was combined with the original solid and the whole was slurried for 2 hr with warm water to dissolve the succinimide. The slurry was filtered and rinsed with water again and oven dried at 50° C. overnight to 120.8 g (79%) of material which is pure enough for the next step. Material recrystallized from toluene melts 138.5°-140.0° C.
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