Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Reexamination Certificate
2007-01-02
2007-01-02
Barts, Samuel (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
Reexamination Certificate
active
11225087
ABSTRACT:
4-aminodiphenylamine is prepared by reacting carbanilide and nitrobenzene in an adequate solvent, which may be nitrobenzene, in the presence of an appropriate organic base, which may be tetramethylammonium hydroxide, alone or in mixture with an inorganic base and subsequently reducing the reaction product in the presence of an appropriate catalyst and hydrogen gas. The subsequent reduction may be carried out on the reaction mixture before the reaction mixture is subjected to separation.
REFERENCES:
patent: 5684203 (1997-11-01), Jautelat
patent: 6395933 (2002-05-01), Triplett et al.
patent: 6583320 (2003-06-01), Triplett et al.
Jang Jung-hee
Kim Jin-eok
Lee Kil-sun
Park Jong-cheon
Barts Samuel
Korea Kumho Petrochemical Co. Ltd.
Mayer Brown Rowe & Maw LLP
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