in tetrahydrofuran (N2); suspn. of Mg compd. in THF was added dropwise over 4 to 8 h to stirred soln. of Sn compd. in THF at ambient temp.; when mixt. was neutral addition of Mg compd. was stopped; stirred for 15 min; satd. NH4Cl added; dried (MgSO4); filtered; concd.; hexane added; chromd. (silica gel, hexane);

in toluene T=0°C; 16 h;

triphenylphosphine; nickel dichloride in tetrahydrofuran T=25°C;

in toluene T=-70°C; 24 h; Yields of byproduct given;

triethylamine 1.) toluene, -70 deg C, 24 h, 2.) toluene; Yield given. Multistep reaction. Yields of byproduct given;

1.) toluene, -70 deg C, 24 h, 2.) toluene, 1 equiv. of MeOH;