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A flask equipped with a stirrer, reflux condenser, dropping funnel and thermometer was charged with 153.0 g (2.0 mol) of allyl chloride, 67.2 mg (0.0001 mol) of di-.mu.-chlorobis(.mu.-1,5-cyclooctadiene)diiridium, and 0.43 g (0.004 mol) of 1,5-cyclooctadiene and heated at 35.degree. C. Once the internal temperature was stabilized, 189.2 g (2.0 mol) of dimethylchlorosilane was added dropwise over 6 hours. During the dropwise addition, the reaction mixture continued to be exothermic. After the completion of dropwise addition, the reaction solution was stirred for one hour at 40.degree. C. The reaction solution was distilled, collecting 317.2 g of a fraction having a boiling point of 84.degree. C./6.7 kPa, which was 3-chloropropyldimethylchlorosilane (yield 92.7%).
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