aluminium trichloride in benzene T=60°C; 6 h;

1.1: 82 percent / acetone / 264 h / 20 °C 2.1: CuI / tetrahydrofuran / -78 - 20 °C 2.2: tetrahydrofuran / 3 h / -40 - 20 °C 2.3: 45 percent / tetrahydrofuran / 20 °C 3.1: 80 percent / methanol / 0.02 h / 20 °C 4.1: 98 percent / AlCl3 / benzene / 6 h / 60 °C View Scheme

1: 80 percent / methanol / 0.02 h / 20 °C 2: 98 percent / AlCl3 / benzene / 6 h / 60 °C View Scheme