lithium aluminium tetrahydride; carbon tetrabromide; tri-n-butyl-tin hydride; toluene-4-sulfonic acid; ethylene glycol; triphenylphosphine 1.) benzene, reflux; 2.) ether, 0 deg C, then Rt, 2 h; 3.) CH2Cl2, Rt, 30 min; 4.) toluene, Rt, 30 min, then reflux 30 min; Yield given. Multistep reaction;