Grignard reagents react readily with phenyl-and diphenylsilane in THF to give good yields of the corresponding di-and trisubstituted silanes. Triphenylsilane was found to react with some Grignard reagents, but only after extended refluxing. Utilizing proper conditions, it was possible to join selectively the silicon-hydrogen groups of phenylsilane to synthesize a number of unsymmetrical organosilicon derivatives containing three or four unlike ...