sodium hydride in benzene T=85 - 90°C; 12 h;

1: NaH / 1.) xylene, reflux, 0.5 h, 2.) xylene, reflux, 16 h 2: 66 percent / NaH / benzene / 12 h / 85 - 90 °C View Scheme

1: 67 percent / N,N-dicyclohexylmethylamine / benzene / 16 h / 90 °C 2: NaH / 1.) xylene, reflux, 0.5 h, 2.) xylene, reflux, 16 h 3: 66 percent / NaH / benzene / 12 h / 85 - 90 °C View Scheme

1: NaH / 1.) xylene, reflux, 0.5 h, 2.) xylene, reflux, 16 h 2: 66 percent / NaH / benzene / 12 h / 85 - 90 °C View Scheme