Hydrogen Sulfide → (3-Mercaptopropyl)trimethoxysilane

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267.6 g of a methanol solution of 22% sodium hydrogensulfide anhydride (1.05 mol) was put into an autoclave with an internal volume of 1 liter, and the air was replaced by nitrogen. 0.3 mol of hydrogen sulfide was then blown in and the system was pressurized to 0.9 kgf/cm2 to oversaturate hydrogen sulfide. After heating the system up to 70° C., 198.7 g (1.0 mole) of 3-chloropropyltrimethoxy silane was dripped for 3 hours, and, during the dripping, 0.05 mol of hydrogen sulfide was blown into the system so that the pressure in the system was kept at 2.5 kgf/cm2. After the dripping, the temperature was raised to 100° C. and the system was aged for 1 hour, followed by cooling. By-product salts produced in the reaction were filtered away. The composition was analyzed by means of gas chromatography. 3-mercaptopropyltrimethoxy silane was obtained with a yield of 94.1%.

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