Method of manufacturing...

Details Method of manufacturing... Method of manufacturing...

2008-12-03

2009-10-13

Parsa, Jafar (Department: 1621)

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

Organic compounds

Amino nitrogen containing

Reexamination Certificate

active

07601873

ABSTRACT:
An object of the present invention is to provide an efficient method of manufacturing 3,3′,4,4′-tetraaminobiphenyl with a smaller number of steps. The manufacturing method of 3,3′,4,4′-tetraaminobiphenyl includes reacting the amino groups of a 4-halo-o-phenylenediamine with an inorganic sulfur compound to lead to a 5-halo-2,1,3-benzothiadiazole, subsequently coupling two molecules of the benzothiadiazole together to form a 5,5′-bis(2,1,3-benzothiadiazole) and then deprotecting the amino groups to yield 3,3′,4,4′-tetraaminobiphenyl.

REFERENCES:
patent: 5041666 (1991-08-01), Ward et al.
patent: 6835854 (2004-12-01), Maner et al.
patent: 6979749 (2005-12-01), Bavikar et al.

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