hydrogenchloride in dichloromethane; water T=20°C;

1: 81 percent / hydrochloric acid; copper(I) chloride / H2O; toluene / 19 h / 87 °C 2: 85 percent / hydrochloric acid / H2O; CH2Cl2 / 20 °C View Scheme

in N,N-dimethyl acetamide T=-5 - 20°C;