triethylsilane; tin(II) trifluoromethanesulfonate; acetyl-bromide; 2,2'-azo-bisisobutyronitrile; tri-n-butyl-tin hydride 1) CH2Cl2, RT, 24h, 2) benzene, 0.5h, reflux; Yield given. Multistep reaction. Yields of byproduct given;