1: 85.1 percent / Et3N / CH2Cl2 / 1 h / Ambient temperature 2: 96.6 percent / Fe / acetic acid; ethanol / 5 h / Heating 3: 46.3 percent / p-benzoquinone, LiCl, PdCl2(CH3CN)2 / tetrahydrofuran / 22 h / 100 °C / sealed tube View Scheme