1: potassium carbonate / benzene / 0 °C 2: methanol / 72 h / Heating View Scheme

1: 77 percent / dimethyl sulphide, N-chlorosuccinimide / toluene / 2 h / -25 °C 2: 97 percent / K2CO3 / toluene; diethyl ether / 0 deg C, 1 h and then RT, 3 h 3: 1) 0 deg C, 4 h, and RT, 15 h, then reflux, 48h, methanol, 2) acetic acid, water, reflux, 8 h View Scheme

2: 77 percent / dimethyl sulphide, N-chlorosuccinimide / toluene / 2 h / -25 °C 3: 97 percent / K2CO3 / toluene; diethyl ether / 0 deg C, 1 h and then RT, 3 h 4: 1) 0 deg C, 4 h, and RT, 15 h, then reflux, 48h, methanol, 2) acetic acid, water, reflux, 8 h View Scheme

in methanol 72 h; Heating; Yield given;

1) 0 deg C, 4 h, and RT, 15 h, then reflux, 48h, methanol, 2) acetic acid, water, reflux, 8 h; Yield given. Multistep reaction;