2,5-dihydroxyterephthalic acid is produced in high yields and high purity from 2,5-dihaloterephthalic acid by contact with a copper source and a ligand that coordinates to copper under basic conditions.
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US Patent 07355070 Process for the synthesis of 2,5-dihydroxyterephthalic acidUS Patent 7355070 Process for the synthesis of 2,5-dihydroxyterephthalic acid