in benzene 0.166667 h; Ambient temperature;

1: (COCl)2 / benzene / a) RT, 3 h, b) 50 - 55 deg C, 30 min 2: 70 percent / benzene / 0.17 h / Ambient temperature View Scheme

sodium hydroxide; potassium hexacyanoferrate(III) 1.) dimethyl sulfoxide, heated on a boiling water bath, 4 h; 2) water, 10 deg C, 2 h; Yield given. Multistep reaction. Yields of byproduct given;