sodium methylate in methanol 5 h; Heating;

1: 1.) oxalyl chloride / 1.) 1,2-dichloroethane, 5 deg C; 2.) RT, 30 min; 40-50 deg C, 45 min; 70 deg C, 15 min 2: 54 percent / 2 N NaOCH3 / methanol / 5 h / Heating View Scheme