Process for preparing 4-aminodiphenylamine intermediates
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United States of America Patent
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May 28, 2002
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app pub date -
Jul 23, 2001
filing date -
Jul 23, 2001
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Abstract
The invention is directed to a method of producing one or more 4-aminodiphenylamine intermediates comprising the steps of bringing an aniline or aniline derivative and nitrobenzene into reactive contact; and reacting the aniline and nitrobenzene in a confined zone at a suitable time and temperature, in the presence of a mixture comprising a strong base and a suitable phase transfer catalyst. Certain phase transfer catalysts may also function as the strong base.
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