(3-Chloropropyl)triethoxysilane → Octanethioic acid, S-(3-(triethoxysilyl)propyl) ester

Participants

Reaction Conditions

Reaction Steps

The aqueous solution of sodium thiooctanoate was heated to 50° C. and stirred with a mechanical stirrer throughout this procedure. To this solution was added 3-chloro-1-propyltriethoxysilane (444 grams, 1.84 moles) all at once. Immediately thereafter was added 0.15 grams of a concentrated aqueous solution of methyltrioctylammonium chloride. A temperature of 50° C. was maintained for 9 hours, with continued stirring, whereupon the temperature was raised to and subsequently maintained at 74° C. for an additional 15 hours, with continuous stirring. At this point, the solution was allowed to cool to ambient temperature, the stirring was stopped, and the organic phase separated from the aqueous phase by decantation in a separatory funnel. Gas chromatography and mass spectrometry (GC and GCMS) revealed a product containing 80% 3-octanoylthio-1-propyltriethoxysilane and 15.5% residual 3-chloro-1-propyltriethoxysilane (reported purities are based on area percent GC responses). The product was vacuum stripped at 110° C. at 0.1 torr to remove volatiles, primarily 3-chloro-1-propyltriethoxysilane, to yield a product of 94% purity. Product identity using this process confirmed by nuclear magnetic resonance spectroscopy (NMR).

Provenance & Evidence