1: 1.) Bu3SnH, azobis(isobutyronitrile) (AIBN) / 1.) benzene, reflux, 1 h, 2.) DMF, 2.5 h 2: 73 percent Spectr. / Bu3SnH, azobis(isobutyronitrile) (AIBN) / toluene / 2.5 h / Heating View Scheme

1: 1.) Bu3SnH, azobis(isobutyronitrile) (AIBN) / 1.) benzene, reflux, 1 h, 2.) DMF, 2.5 h 2: 85 percent Spectr. / HgCl2 / acetonitrile; H2O / 0.5 h / Ambient temperature View Scheme