Chloroprene → 4-Chloro-3,6-dihydrophthalic anhydride

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Chloroprene (13.6 g) and bromomaleic anhydride 14.6 g) were added together and the solution was heated to 50° C. for 11.5 hours. The reaction mixture was taken up in hot petroleum ether (bp 60° to 80° C.) and filtered. After cooling to room temperature, a solid was collected (6.2 g)- An additional 5 g of material remained in the mother liquors. The material consisted of a mixture of 4-chloro-3,6-dihydrophthalic anhydride, 4-chloro-l-bromo-1,2,3,6-tetrahydrophthalic anhydride and 4-chloro-2-bromo-1,2,3,6-tetrahydrophthalic anhydride.

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