Catalysts for the Control of Automotive Pollutants Catalysts by McEvoy J.E. (ed.)

By McEvoy J.E. (ed.)

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Silicon tetraethyl similarly may be made by the action of zinc ethyl on silicon tetrachloride at 160, by the action of zinc ethyl and sodium on ethyl silicate, 22 by sodium condensation of ethyl bromide and silicon tetrachloride, 23 or by the Grignard synthesis. 24 It can easily be separated from ether by distillation because it boils at 154. The ethyl groups may be chlorinated without breaking the Gilliam, J. Am. Chem. Soc. 67, 1772 (1945). and Crafts, Ann. 136, 203 (1865). 20 and Crafts, Ann.

51, 3067 (1929). Taurke, Ber. 38, 1664 (1905). 41 Ladenburg, Ann. 164, 302, 327 (1872). * Following the recommended system of nomenclature (reference 6, Chapter 1), the alkyls having two or more different groups on the silicon are named as deriva" " silicon tetrais reserved for those compounds in tives of silane and the term four substituents all are alike. which the 38 39 40 THE ALKYLHALOSILANES CH 33 In order to make methylsilane, silane. it was necessary 3 SiH 3 to convert silane to monochlorosilane and then treat this with zinc , 42 By chlorinating again and repeating the reaction with zinc methyl, dimethykilane was obtained.

R than it otherwise would be. In all of the organosilicon syntheses so far discussed, an organo metallic compound has been used as the substitution reagent, whether prepared separately or not. From an over-all point of view, a metal is used as condensing agent or halogen acceptor, and the organic groups are transferred from a more reactive metal to a less reactive metalloid exchange for halogen or its equivalent. Of the several the Grignard reaction has become the most widely used bemethods, cause the organomagnesium compound is the most easily prepared.

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