Silicon diehloride

Benzylethylpropylchlorosilicane is produced from benzylethyl-silicon diehloride (1 mol.) and propyl magnesium bromide (1 mol.). It is a colourless, fuming, mobile liquid, which generally becomes pink, and is immediately decomposed by water, yielding the corresponding silicol and oxide. It boils at 172° to 176° C. at 50 mm., and the yield is 50 to 60 per cent, of the theoretical. 

Benzylethyl silicon dichloride is obtained as above, using the benzyl Grignard reagent. To avoid formation of too much dibenzyl, the reaction is carried out at 0° C. The two products obtained are benzylethyl silicon diehloride and dihemylethyl silicon chloride. The former is a mobile, fuming liquid, B.pt. 160° C. at 100 mm. 

According to E. Lay, if a soln. of silicon tetrachloride in benzene be mixed with an emulsion of hydrazine in dry benzene, a white powder is obtained which is a mixture of crystals of hydrazine diehloride, and amorphous grains of a substance with the empirical composition, Si(NH)4, or Si(N2H2)2. A separation with organic solvents is not possible. 

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