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June, 1946ORGANOSILICON COMPOUNDS :calculations, however, the constants directly determine from the compressibility data and presented in Table I should be used. It is to be remarked that the constants have compensating effect and that two sets of constants even with appreciable numerical differences may yield similar results so far as the compressibility, not the derivatives of the quantities, is concerned.Acknowledgment+The writers are grateful to Professor James A. Beattie and Professor Warren K. Lewis for their suggestions and encouragement. summary 1. A generalized form of Beattie-Bridgeman equation of state is proposed 8-ELIMINATIONS INVOLVING SILICON 1083 where e' 3 C ' l d S T 3 p / p , reduced pressure 8 3 T/T,, reduced temperature (p 3 V / Val, ideal reduced volume V, = RTJp,, ideal critical volume The constants A6, a', Bi, b' and c' have the same numerical values irrespective of nature of gas as follows Ab = 0.4758 Bo' = 0.18764 c' = 0.05 a' = 0.1127 b' = 0.03833 2. The proposed generalized equation holdsfor seventeen gases with an average deviation of 2% or less for each gas up to nearly the critical density. It is believed that the proposed equation may be applied in general to all real gases.a-Chloroethyltrichlorosilane with methylmagnesium bromide gives a-chloroethyltrimethylsilane with no attack on the alpha chlorine.8 CHsCHCISiClo + 3CHsMgBr + CHsCHClSi(CH&