sodium hydroxide; PPA in ethyl acetate

1: oxalyl chloride / 1,2-dichloro-ethane; dimethylformamide / 0.33 h / 20 °C 2: 53 percent / aluminium trichloride; molecular sieves 4 Angstroem / 1,2-dichloro-ethane; dimethylformamide / 20 °C View Scheme

PPA-P2O5 T=100°C; 1 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;