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A flask equipped with a stirrer, reflux condenser, dropping funnel and thermometer was charged with 500 mL (0.73 mol) a tetrahydrofuran solution of 1.46M vinylmagnesium chloride, to which 119.8 g (0.7 mol) of chloropropyldimethylchlorosilane was added dropwise over 2 hours at an internal temperature of 25-50° C. The reaction solution was stirred for 2 hours. A salt formed was removed by filtration. By subsequent distillation, the target compound, chloropropyldimethylvinylsilane was collected as a fraction having a boiling point of 82° C./5 kPa in an amount of 104.4 g (yield 92%).

1. customA flask equipped with a stirrer
2. temperaturereflux condenser
3. customA salt formed
4. customwas removed by filtration
5. distillationBy subsequent distillation
6. customthe target compound, chloropropyldimethylvinylsilane was collected as a fraction