potassium hydroxide; oxalyl dichloride 1.) methanol, 5 deg C, 50 h, 2.) benzene, 35 deg C, 3 h; Multistep reaction. Title compound not separated from byproducts;

dichloromethoxy methane 12 h;

1: CF3COOH / 4 h / 20 °C 2: CHCl2OMe / 12 h View Scheme