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Synlett 1990; 1990(6): 339-340
DOI: 10.1055/s-1990-21085
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Selective Hydrodechlorination of 3,4,5,6-Tetrachlorophthalic Anhydride: Preparation of 3,4,6-Trichlorophthalic Acid

Neil J. O'Reilly* , William S. Derwin, Henry C. Lin
  • *Occidental Chemical Corporation, Technology Center, 2801 Long Road, Grand Island, NY 14072, USA
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Publication Date:
08 March 2002 (online)

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3,4,6-Trichlorophthalic acid was easily prepared on a large scale in high yield and selectivity by hydrodechlorination of 3,4,5,6-tetrachlorophthalic anhydride with zinc dust in aqueous sodium hydroxide (5 wt %).