zinc in tetrahydrofuran byproducts: ZnBr2; fast addn. of concd. soln. of Ge halide and a large excess of tetrabromide to a heated suspension of activated Zn; refluxing, 2h;

zinc in tetrahydrofuran byproducts: ZnF2, ZnBr2; fast addn. of concd. soln. of Ge halide and a large excess of tetrabromide to a heated suspension of activated Zn; refluxing, 2h;

zinc in tetrahydrofuran byproducts: ZnBr2, ZnCl2; slow addn. of soln. of Ge halide and tetrabromide (molar ratio tetrabromide/Ph2GeCl2 = 1.5) to activated Zn suspension; boiling, 5h;

zinc in tetrahydrofuran byproducts: ZnBr2, ZnI2; slow addn. of soln. of equimolar amts. of Ge halide and tetrabromide to activated Zn suspension; boiling, 5h;