1: triethylamine / methanol / 5 h / 20 °C 2: air / toluene / 1 h / 20 °C 3: toluene / 1 h / 20 °C 4: 73 percent / acetic acid; air / 3 h / 85 °C View Scheme

in ethanol 2 h; Heating;

trichlorophosphate 1.) s-dichloroethane, rt, 30 min; 2.) s-dichloroethane, 5 h; Yield given. Multistep reaction. Yields of byproduct given;