Dimethyl Sulfoxide → 3(m-diethylaminophenoxy)propyl Trimethoxysilane

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Using the general procedure described in the preceding Example 1, a reactor was charged with 90.75 g (0.55 mole) m-diethylaminophenol, 112 cc dimethylsulfoxide, 120 cc toluene and 43.28 g of a 50% aqueous sodium hydroxide solution. All of the water present in the reactor was removed by azeotropic distillation. The reaction mixture was allowed to cool to 80° C., at which time 109 g (0.55 mole) of chloropropyl trimethoxysilane were gradually added over a period of 2 hours. The temperature of the reaction mixture increased to 88° C. during the addition. Following completion of the addition, external heating was applied to maintain the temperature of the reaction mixture at 80° C. for 16 hours. The reaction mixture was then allowed to cool and was filtered. The liquid phase was recovered and evaporated under a pressure of 5 mm of mercury to remove the toluene and dimethylsulfoxide. The pressure inside the reactor was reduced to 2 mm and the product, 3(m-diethylaminophenoxy)propyl trimethoxysilane, distilled at a temperature of 185°-187° C. Analysis by vapor phase chromatography demonstrated that the product was 97% pure.

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