copper(l) iodide; Li naphtalide; triphenylphosphine 1) THF, 0 deg C; 2) -35 deg C, 10-15 min; 3) -35 deg C, 90 min; -> r.t., 30 min; Yield given. Multistep reaction;

Multi-step reaction with 2 steps 1: 4.74 g / LiCl; CuCl2 / tetrahydrofuran; diethyl ether / 2 h / -20 °C2: 85 percent / m-CPBA / CH2Cl2 / 20 h / 20 °C  

With  copper(l) iodide; Li-naphthalenide; triphenylphosphine  1) THF, -35 deg C, 15 min; 2) -35 deg C, 1.5 h;  Yield given. Multistep reaction;