1: 70 percent / phosphorus oxychloride / 2.5 h / Heating 2: 60 percent / zinc, iodine / tetrahydrofuran / 2 h / Heating 3: 44 percent / 2N methanolic KOH / 3 h / Heating 4: oxalyl chloride / benzene / 2 h / Heating View Scheme

1: 60 percent / zinc, iodine / tetrahydrofuran / 2 h / Heating 2: 44 percent / 2N methanolic KOH / 3 h / Heating 3: oxalyl chloride / benzene / 2 h / Heating View Scheme

oxalyl dichloride in benzene 2 h; Heating;

1: 44 percent / 2N methanolic KOH / 3 h / Heating 2: oxalyl chloride / benzene / 2 h / Heating View Scheme

in benzene Ambient temperature; Yield given;