n-butyllithium in diethyl ether an equimol. amt. of n-BuLi was added dropwise under inert atmosphere toa soln. of o-BrC6H4OSnEt3 in ether, reaction mixt. was treated with Me3SiCl; o-BrC6H4OSiMe3 was isolated by distillation, n-BuSnEt3 was identified in the reaction mixt. by (1)H NMR spectroscopy;