Process for preparing o-phenylenediamine
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United States of America Patent
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Jun 10, 1980
Grant Date -
N/A
app pub date -
Aug 11, 1978
filing date -
Aug 12, 1977
priority date (Note) -
Expired
status (Latency Note)
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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.
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