1: diethyl ether / 1.) -78 deg C, 2.) -30 deg C, 2: 1.) silver perchlorate, CaCO3, 2.) tri-n-butyltin hydride, AIBN / 1.) nitromethane, -15 deg C, 2.) benzene, reflux, 4.5 h View Scheme

2,2'-azo-bisisobutyronitrile; tri-n-butyl-tin hydride; silver perchlorate; calcium carbonate 1.) nitromethane, -15 deg C, 2.) benzene, reflux, 4.5 h; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;