Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Reexamination Certificate
2008-03-11
2008-03-11
Oh, Taylor Victor (Department: 1625)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
Reexamination Certificate
active
10977618
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.
REFERENCES:
patent: 1307409 (1973-02-01), None
patent: WO 03/099890 (2004-12-01), None
Crompton Corporation
Oh Taylor Victor
Sher Jaimes
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