anhydrous iron chloride in dichloromethane T=20°C; 0.8 h; Inert atmosphere;

1.1: sodium hydride / tetrahydrofuran; mineral oil / 1 h / 0 °C / |Inert atmosphere 1.2: 8 h / 20 °C / |Inert atmosphere 2.1: anhydrous iron chloride / dichloromethane / 0.8 h / 20 °C / |Inert atmosphere View Scheme