zinc/copper couple in tetrahydrofuran; toluene Ar atmosphere, addn. of soln. of MeI to Cu/Zn, filtration, cooling (-30°C), addn. of SnCl4 in THF/toluene (1:1) (dropwise, stirring, 2 h), stirring, (50°C, 12 h), solvent removed; dissolving (toluene), washing (HCl), drying (over Na2SO4), solvent removed, recrystn. (diethyl ether/toluene); elem. anal.;

in acetone

in tetrahydrofuran 40°C;