[Cl:1][CH:2]=[CH:3][CH2:4][C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][CH:6]=1.ClC1C=CC=C(C(OO)=[O:19])C=1>C(Cl)(Cl)Cl>[Cl:1][CH:2]=[CH:3][CH2:4][C:5]12[O:19][CH:6]1[CH:7]=[CH:8][CH:9]=[CH:10]216.6 g of o-chloroallylbenzene was dissolved in 100 ml of chloroform and to the mixture was added dropwise, while maintaining the temperature at 0° - 5° C, 25 g of m-chloroperbenzoic acid dissolved in 600 ml of chloroform. The resulting mixture was allowed to stand at the same temperature for 72 hours. After the separated m-chlorobenzoic acid was filtered off, the filtrate was washed with 10% sodium hydroxide solution, then with water and dried over anhydrous sodium sulfate. The solvent was evaporated to obtain the residue, which was distilled under reduced pressure to give 7.2 g (yield 38.8%) of o-chloroallylbenzene oxide having a boiling point of 93° C/3 mmHg.
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