Mn(CO)5(x), X=Cl,Br in tetrahydrofuran N2-atmosphere; stirring (-90°C, 2 h, room temp., 1 h); evapn. (vac.), chromy. (SiO2, CH2Cl2 / petroleum ether = 1 : 1); elem. anal.;

CuI in tetrahydrofuran byproducts: 2,2'-bithiophene; N2-atmosphere; stirring (-50°C, 10 min), Mn-complex soln. addn. (-90°C); evapn., chromy. (SiO2, CH2Cl2 / petroleum ether = 1 : 1);

Mn(CO)5(x), X=Cl, Br in tetrahydrofuran N2-atmosphere; stirring (-90°C, -10°C, 1 h); evapn., chromy. (SiO2, CH2Cl2 / petroleum ether = 1 : 1); elem. anal.;