2,5-Dihydroxyterephthalates, 2,5-Dichloro-1,4-benzoquinone-3,6-dicarbox­ylates, and Polymorphic 2,5-Dichloro-3,6-dihydroxyterephthalates

Abstract

Reaction of 2,5-dihydroxycyclohexa-1,4-diene-1,4-dicarboxylates with one equivalent of N-chlorosuccinimide cleanly gives 2,5-dihydroxyterephthalates; reaction with four equivalents of N-chlorosuccinimide gives 2,5-dichloro-1,4-benzoquinone-3,6-dicarboxylates instead. The latter compounds react with sodium dithionite to give 2,5-dichloro-3,6-dihydroxyterephthalates, which will find use in the study of polymorphic phase changes.

Key words

arenes - halogenation - hydroquinones - polymorphism - quinones

References

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1

Current address: L. Hintermann, Institute of Organic Chemistry, RWTH, Aachen, Germany.