S(Cl)([Cl:3])=O.[Cl:5][C:6]1([C:11]([OH:13])=O)[CH2:8][C:7]1([Cl:10])[Cl:9]>C1C=CC=CC=1>[Cl:5][C:6]1([C:11]([Cl:3])=[O:13])[CH2:8][C:7]1([Cl:10])[Cl:9]Thionyl chloride (50 ml) was added to a solution of 1,2,2-trichlorocyclopropane carboxylic acid (47.4 grams) in 300 ml of benzene. The reaction mixture was heated to reflux temperature and stirred for approximately 20 hours. The solvents were evaporated in vacuo to provide the intermediate acid chloride derivative, 1,2,2-trichlorocyclopropane carboxylic acid chloride (43.8 grams).
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