Process for the production of pure 3,3',4,4'-tetraamino-biphenyl

Details Process for the production of pure 3,3',4,4'-tetraamino-biphenyl Process for the production of pure 3,3',4,4'-tetraamino-biphenyl

1992-07-08

1993-08-10

Raymond, Richard L.

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

Organic compounds

Amino nitrogen containing

C07C20984

Patent

active

052351050

ABSTRACT:
The present invention relates to a process for the preparation of pure 3,3',4,4'-tetraaminobiphenyl in high yield by ammonolysis of 3,3,-dichlorobenzidine in the presence of copper powder and CuCl. After the crude product has been washed with ammonia water and water, the 3,3',4,4'-tetraaminobiphenyl, thus pretreated, is crystallized in water in the presence of 0 to 5% by weight of activated carbon and of about 1 to 2% by weight of a water-soluble reducing agent at temperatures of about 100.degree. to about 140.degree. C., under a protective gas atmosphere (redissolution). The water-soluble reducing agent is an alkali metal dithionite or alkali metal sulfite. The protective gas used can be nitrogen. The water used in the recrystallization (redissolution water) can be reused in whole or in part in the recrystallization.

REFERENCES:
patent: 3390180 (1968-06-01), Fontana et al.
patent: 3943175 (1976-03-01), Druin et al.
patent: 4433168 (1984-02-01), Schubert et al.
M. Toda et al., Chem. Abs. 104: 1091816 (1986).

Affiliated with

Also associated with

Rating

Process for the production of pure 3,3',4,4'-tetraamino-biphenyl does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the production of pure 3,3',4,4'-tetraamino-biphenyl, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production of pure 3,3',4,4'-tetraamino-biphenyl will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1726701