1: 68 percent / acetonitrile / Heating 2: tri-n-butyltin hydride, AIBN / acetonitrile; tetrahydrofuran / 3 h / Heating View Scheme

2,2'-azo-bisisobutyronitrile; tri-n-butyl-tin hydride in tetrahydrofuran; acetonitrile 3 h; Heating; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

T=120°C;