[Cl:1][C:2]1[CH:15]=[C:14]([CH3:16])[CH:13]=[C:12]([Cl:17])[C:3]=1[C:4]([C:6]1[CH:11]=[CH:10][CH:9]=[CH:8][CH:7]=1)=[O:5].C(OOC(=O)C1C=CC=CC=1)(=O)C1C=CC=CC=1.[Br:36]N1C(=O)CCC1=O>C1C=CC=CC=1>[C:4]([C:3]1[C:2]([Cl:1])=[CH:15][C:14]([CH2:16][Br:36])=[CH:13][C:12]=1[Cl:17])(=[O:5])[C:6]1[CH:7]=[CH:8][CH:9]=[CH:10][CH:11]=1A refluxing solution of 2,6-dichloro-4-methylbenzophenone (3.44 g, 13.0 mmol) and dibenzoylperoxide (325 mg, 1.34 mmol) in benzene (130 ml) was treated in portions with N-bromosuccinimide (2.75 g, 15.5 mmol). After 3 hours at reflux, the mixture was cooled and evaporated under vacuum. The residue was triturated with diethyl ether (150 ml), filtered, and evaporated under vacuum. The residue was chromatographed on a column of silica gel (250 g) eluted with 4:1 (v/v) hexane-dichloromethane to provide 2.58 g (58%) 4-benzoyl-3,5-dichlorobenzyl bromide, m.p. 111°-113° C.
Wird geladen…
