By Walter Noll
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5 35 DIRECT SYNTHESES INFLUENCE OF TEMPERATURE AND PRESSURE The reaction temperature is determined primarily by the nature of the organic halide used. The optimum in the CH C1/Si system lies between 250 and 300°C, but in the C H C1/Si system it is appreciably higher (400 to 600°C). The catalyst employed has, moreover, a considerable influence on the optimum reaction temperature; the data given above relate to copper and silver as the catalysts. A somewhat higher temperature is usually required to start up the reaction than to keep it running.
News24, 1233 . (27) Chem. Ind. 1 4 , J u n e , 308 1962. (28) Chemical Week, 1 9 5 8 , 85. ( 2 9 ) / . Chem. Soc. [ L o n d o n ] 1 9 5 2 , 5064. (30) Kunststoffe 5 4 , 71 . (30a) Nomenclature of organic chemistry, Sect. , published by I U P A C , L o n d o n , B u t t e r w o r t h s , 1966. (31) Rubber and Plastics Age 1959, 136. 1 Monomers in Silicone Chemistry The starting materials for the preparation of polyorganosiloxanes are usually monomeric organosilicon compounds simultaneously containing organic groups and silicon-functional groups.
On being boiled under reflux with an excess of phenylmagnesium bromide in tetrahydrofuran, diphenylsilane gives triphenylsilane in 7 9 % yield (100). It must be realized that if an organic halide compound or a Grignard com pound is used in which the halogen is different from that of the silicon halide, a certain degree of exchange can take place between the halogen atoms during Grignard reaction (139). Of the alkoxysilanes, the derivatives of the lower aliphatic alcohols, par ticularly S i ( O C H ) and S i ( O C H ) , are most suitable for the Grignard reaction.
Chemistry and Technology of Silicones by Walter Noll