2,2'-azo-bisisobutyronitrile; tri-n-butyl-tin hydride in benzene Heating;

1: 1) NaH, hexamethylphosphoramide, 2) NaI / 1) THF, mineral oil, 1 h, room temperature, 2) 4 h, reflux 2: 30 percent / n-Bu3SnH, AIBN / benzene / 1 h / Heating View Scheme

T=20°C; 14 h;

1: 13 percent / NaH, HMPA / tetrahydrofuran; paraffin / 17 h / Heating 2: 1) NaH, hexamethylphosphoramide, 2) NaI / 1) THF, mineral oil, 1 h, room temperature, 2) 4 h, reflux 3: 30 percent / n-Bu3SnH, AIBN / benzene / 1 h / Heating View Scheme