Process for preparing o-phenylenediamine

Details Process for preparing o-phenylenediamine Process for preparing o-phenylenediamine

1978-08-11

1980-06-10

Doll, John

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260581, C07C 8511, C07C 8504

Patent

active

042072611

ABSTRACT:
The invention relates to a process for preparing o-phenylenediamine. According to the invention 1,4-dichlorobenzene is nitrated to give 2,5-dichloro-nitrobenzene which is then reacted with an aqueous ammonium hydroxide solution and the 4-chloro-2-nitraniline obtained is subjected to catalytic hydrogenation to afford the end product which can thereafter be separated.
The process according to the invention can be accomplished with a total yield of about 90% related to the 1,4-dichlorobenzene starting compound.
o-Phenylenediamine is a valuable intermediate for instance in the synthesis of plant protecting agents and heat-resistant polymers.

REFERENCES:
patent: 3576876 (1971-04-01), Raper et al.
Fierz-David, Blangey: Farbenchemie 104, Springer verl. (1947).
Winnacker-Kuchler: Kemiai Technologia I. 739, Muszaki Konyvkiado, Budapest (1961).
Augustine, "Catalytic Hydrogenation", pp. 91-93 & 125-129 (1965).
Svishchuk et al, "Chem. AB.", vol. 59, AB. No. 6288a (1963).

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