1.1: (x)BF4*C9H14NO(1+) / dichloromethane / 1 h / -78 °C 1.2: 20 °C 2.1: N,N,N',N',N'',N''-hexamethylphosphoric triamide; copper(I) bromide dimethylsulfide complex / tetrahydrofuran / 2 h / -78 °C 2.2: 2 h / -78 °C 2.3: 20 °C 3.1: (x)BF4*C9H14NO(1+) / dichloromethane / 1 h / -78 °C 3.2: 20 °C View Scheme

1: With (x)BF4*C9H14NO(1+) in dichloromethane T=-78°C; 1 h; 2: With sodium hydrogencarbonate in dichloromethane; water T=20°C;