lithium-sodium alloy in tetrahydrofuran; hexane T=50°C; 1.5 h; sonication; Further byproducts given;

1: 1) Mg, 2) CuCl2, LiCl / 1) BrCH2CH2Br, THF, a) sonication, 50 deg C, 30 min, b) reflux, 2 h, 2) THF, a) ice/salt bath, 5 h, b) r.t., overnight 2: 0.21 g / Li/Na / hexane; tetrahydrofuran / 1.5 h / 50 °C / sonication View Scheme

1: 1) NaH / 1) THF, -10 to -5 deg C, 2 h, 2) THF, a) rt, 2 h, b) reflux, 2 h 2: 1) Mg, 2) CuCl2, LiCl / 1) BrCH2CH2Br, THF, a) sonication, 50 deg C, 30 min, b) reflux, 2 h, 2) THF, a) ice/salt bath, 5 h, b) r.t., overnight 3: 0.21 g / Li/Na / hexane; tetrahydrofuran / 1.5 h / 50 °C / sonication View Scheme