1: methanesulphonic acid / acetic anhydride; 1,2-dichloro-ethane / 35 °C 2: 80 percent / methanesulphonic acid / acetic anhydride; 1,2-dichloro-ethane / 35 °C 3: sodium bis(2-methoxyethoxy)aluminium hydride / benzene / 10 h / 80 °C View Scheme

Multi-step reaction with 2 steps 2: 77 percent / potassium carbonate / H2O; toluene; benzene / 1.) 0 deg C, 30 min; 2.) 35 deg C, 24 h  

Multi-step reaction with 2 steps 1: methanesulphonic acid / acetic anhydride; 1,2-dichloro-ethane / 35 °C2: 80 percent / methanesulphonic acid / acetic anhydride; 1,2-dichloro-ethane / 35 °C