O-Xylene → HCID 21439246, compound

Participants

Reaction Conditions

Reaction Steps

(2-Triethoxysilylethyl)divinylcyclohexane was prepared from triethoxysilane and 1,2,4-trivinylcyclohexane using the procedure disclosed in Example 1 of U.S. Pat. No. 7,696,269 for trimethoxysilane and 1,2,4-trivinylcyclohexane. A 5 liter, three-neck round bottomed flask fitted with a heating mantle, mechanical stirrer, addition funnel, Friedrich condenser, nitrogen inlet and thermocouple/temperature controller was charged with 1800 g TVCH (11.1 moles) and 3.6 g of a solution (1 wt % Pt) of Karstedt's platinum catalyst in xylene. The contents of the flask were stirred and heated to 90° C. Triethoxysilane (1641 g, 9.99 moles), which had been placed in the addition funnel, was then added slowly over a four hour period to control the exotherm. The temperature remained between 101-109° C. during the addition. The SiH/Vinyl molar ratio in the reaction was 1:3. GC analysis of the crude reaction product gave 21 wt % unreacted TVCH, 48 wt % mono-hydrosilylated product, ((2-Triethoxysilylethyl)divinylcyclohexane), 26.3 wt % bis ((2-Triethoxysilylethyl)vinylcyclohexane and 2.7 wt % tris ((2-Triethoxysilylethyl)cyclohexane. The gravimetric ratio of mono to bis was 1.82.

Provenance & Evidence