Process for the preparation of 4-oxo-4-((4-(phenylamino)phenyl)amino)-2-butenoic acid
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United States of America Patent
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Mar 11, 2008
Grant Date -
Apr 27, 2006
app pub date -
Oct 27, 2004
filing date -
Oct 27, 2004
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Abstract
A process for the preparation of 4-oxo-4-((4-(phenylamino)phenyl)amino)-2-butenoic acid includes reacting p-aminodiphenyl amine and maleic anhydride in a reaction first mixture containing a volatile organic solvent under suitable reaction conditions to provide a second mixture containing 4-oxo-4-((4-(phenylamino)phenyl)amino)-2-butenoic acid product; subjecting the second mixture to vacuum distillation to remove the volatile organic solvent while simultaneously adding diluent oil to produce a dispersion of 4-oxo-4-((4-(phenylamino)phenyl)amino)-2-butenoic acid in the diluent oil.
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