Hydrochloric Acid → 4-Chloro-3,6-dihydrophthalic anhydride

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A 3-necked 50 mL flask was equipped with a pressure equalizing addition funnel, a thermocouple well with thermocouple, a water cooled condensor and a magnetic stir bar. The flask was charged with 13.2 g (0.10 mol) of a 90/10 GC area % mixture of monochloromaleic anhydride and dichloromaleic anhydride and 50 mg of phenothiazine. The contents of the flask were heated to 80 to 130° C. and 8.8 g (0.1 mol) of chloroprene was added over 15 to 30 minutes. HCl gas was observed evolving from the reactor. After 6 hours at 130° C. the contents of the flask were multiple distilled into two fractions resulting in the isolation of 12.08 g of 4-chloro-3,6-dihydrophthalic anhydride which was identified by 13C 1H NMR and MS.

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