[CH3:1][C:2]1([CH3:12])[CH:4]([CH:5]=[CH:6][CH2:7][CH3:8])[CH:3]1[C:9](O)=[O:10].S(Cl)([Cl:15])=O>CN(C)C=O.CCCCCC>[CH3:1][C:2]1([CH3:12])[CH:4]([CH:5]=[CH:6][CH2:7][CH3:8])[CH:3]1[C:9]([Cl:15])=[O:10]Fifty grams (50 g) of 2,2-dimethyl-3-(1-butenyl)cyclopropanecarboxylic acid, 350 ml of hexane and 0.6 g of N,N-dimethylformamide were mixed together. At 50° C., 39 g of thionyl chloride was eye-dropped thereto over 30 minutes. Subsequently, the reaction mixture was stirred for 1 hour at 50° C. The reaction mixture was then concentrated under reduced pressure to provide 48 g of 2,2-dimethyl-3-(1-butenyl)cyclopropane carboxylic chloride.
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