phenyllithium in diethyl ether dropwise addn. of epoxyethyl(triphenyl)tin in ether to PhLi in ether (temp.: -78°C); quenching with water and CH2Cl2, drying of org. layer, concn. of org. layer, pptn.;

water 1.) ether, -78 deg C; 2.) ether, CH2Cl2, 0 deg C; Yield given. Multistep reaction;