2,2'-azo-bisisobutyronitrile; tri-n-butyl-tin hydride in benzene 0.416667 h; Heating;

sodium hydroxide; 2,2'-azo-bisisobutyronitrile; tri-n-butyl-tin hydride 1) benzene, reflux, 20 min, 2) pyridine, RT, 20 min; Yield given. Multistep reaction;