zinc in tetrahydrofuran fast addn. of concd. soln. of Ge halide and a large excess of tetrabromide to a heated suspension of activated Zn; refluxing, 2h;

Na or Li in tetrahydrofuran byproducts: NaCl or LiCl, NaBr or LiBr; mixt. boiled for 3-4 h; GC-MS detn. of products;