Reusable transition metal complex catalyst useful for the...

Details Reusable transition metal complex catalyst useful for the... Reusable transition metal complex catalyst useful for the...

2011-08-16

2011-08-16

Kosack, Joseph (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C556S137000

Reexamination Certificate

active

07999112

ABSTRACT:
The present invention provides a reusable transition metal complex catalyst useful for the preparation of high pure quality 3,3′-diaminobenzidine and its analogues. The present invention also provides to a process for the preparation of a reusable transition metal complex catalyst. The present invention further provides a process for the preparation of 3,3′-diaminobenzidine (DAB) or 3,3′,4,4′ Tetraminobiphenyl (TAB) using reusable transition metal complex catalyst. The high quality 3,3′-diaminobenzedine (DAB) and its analogues are prepared by coupling 4-halo-2-nitroaniline to 3,3′-dinitrobenzidine (DNB) using transition metals as catalysts followed by reduction of 3,3′-dinitrobenzidine to the corresponding substituted 3,3′-diaminobenzidine of formula 1 in high yields.

REFERENCES:
Ramesh Kumar et al. “Sulfonamide- and hydrazine-based palladium catalysts: Stable and efficient catalysts for C—C coupling reactions in aqueous medium” Journal of Molecular Catalysis A: Chemical 2007, vol. 269, pp. 218-224.

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