Magyar Asvanyolaj Es Foldgaz Kiserleti Intezet

Zsuzsa Wittman

Rezso Csikos

Zoltan Decsy

Zsolt Varga

Zeno Trocsanyi

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.

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Veszprem, Hungary

Zsuzsa Wittman