1: 87 percent / nickel peroxide / diethyl ether / 0 deg C, 30 min --> r.t. 2: 51 percent / FeCl3 / CH2Cl2 / 48 h / 0 °C View Scheme

sec.-butyllithium 1) TMEDA/hexane, -78 deg C, 2 h -->0 deg C, 10 min; 2) TMDA/hexane, 0 deg, C, 2 min; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;

NiO2 in diethyl ether 0 deg C, 30 min --> r.t.;