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Synlett 1990; 1990(9): 539-540
DOI: 10.1055/s-1990-21158
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Aromatization of Halogenated Tetrahydrophthalic Anhydrides with Activated Carbon. An Effective Preparation of 4,5-Dichlorophthalic Anhydride

Lawrence B. Fertel* , Ronald F. Spohn, Neil J. O'Reilly, Henry C. Lin
  • *Occidental Chemical Corporation, Technology Center, 2801 Long Road, Grand Island, New York 14072, USA
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Publication Date:
08 March 2002 (online)

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Halogenated tetrahydrophthalic anhydrides (4-cyclohexene-1,2-dicarboxylic anhydrides) can be aromatized to phthalic anhydrides in a simple manner by using activated carbon in a high boiling solvent (1,2,4-trichlorobenzene). The method has been applied to the preparation of 4,5-dichlorophthalic anhydride and 4-chlorophthalic anhydride starting from the corresponding chloro-substituted 4-cylohexene-1,2-dicarboxylic anhydrides.

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