iodine in acetonitrile T=25°C; 0.333333 h;

in dimethyl sulfoxide T=150°C; 2.5 h;

in toluene under dry Ar atm.; soln. contg. 2,3-diphenylbenzo(g)quinoxaline and PhCH2Mn(CO)5 in dry toluene was refluxed for 14 h; soln. evapd. (vac.); residue dissolved (CH2Cl2); silica gel added; solvent removed (vac.); coated silica gel loaded on the top of a SiO2 column packed in dry n-hexane at 2°C; eluted (CH2Cl2:hexane, 1:4 and 1:1as eluents); solvent removed; elem.;

in n-heptane under dry Ar atm.; soln. contg. 2,3-diphenylbenzo(g)quinoxaline and PhCH2Mn(CO)5 in n-heptane was refluxed for 18 h; soln. was stripped of solvents; dissolved (CH2Cl2); silica gel added; solvent removed (vac.); coated silica gel was loaded on the top of a silica gel column packed in dry n-hexane (n-hexane, CH2Cl2:hexane, 1:9 as eluents); elem. anal.;