Paroxypropion

synthetischePreparation by Fries rearrangement of phenyl propionatewith aluminium chloride in refluxing carbon disulfide then at 130–150° for 2–3 h after solvent elimination (45–50%)with aluminium chloride in nitrobenzene at 50° for 18 h (72%) or at 20° for 48 h (60%) with aluminium chloride in nitromethane at 20° for 7–8 days (80%) with aluminium chloride in chlorobenzene using microwave irradiation for 3 min at 106° (62%) with aluminium chloride in ethylene dichloride at 95° for 5 h or in heptane at 80–90° for 7 h (36%), in benzene or in tetrachloroethane at 80°; with aluminium chloride in the presence of propionyl chloride at 50–60° for 6 h (49%)with aluminium chloride without solvent at 50° for 10 h with titanium tetrachloride in nitromethane at 20° for 7 days (56%) or without solvent at 50° for 10 h (39%) with polyphosphoric acid at 100° (61%) with boron trifluoride at 50° for 3 h (46%) with stannic chloride at 50° for 3 h (10%).