| 摘要 |
A process for the preparation of 2,5-diarylaminoterephthalic acids by oxidation of 2,5-diarylamino-3,6-dihydroterephthalic acid esters using oxygen or oxygen-containing gases, preferably air, in alcoholic-alkaline or alcoholic-aqueous-alkaline solution or suspension in the presence of an oxygen-transferring agent and working up to give the 2,5-diarylaminoterephthalic acids, characterized in that the oxidation is carried out in the presence of quaternary ammonium compound.
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