sodium in 1,4-dioxane byproducts: NaCl; a soln. of o-ClC6H4OSnBu3 in dry dioxane was added to a suspn. of Na (10percent excess) within 10-15 min under inert atmosphere, mixt. was stirred for 8 h at 20°C, an excess of Me3SiCl added, stirred for 15 h at 20°C; reaction mixt. was filtered and distilled; elem. anal. for o-Bu3SnC6H4OSiMe3;

at room temp.;