Process for the preparation of asymmetrical N-phenyl-N'-substitu

Details Process for the preparation of asymmetrical N-phenyl-N'-substitu Process for the preparation of asymmetrical N-phenyl-N'-substitu

1979-02-23

1980-07-01

Doll, John

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

252439, C07C 8508, C07C 8511

Patent

active

042106028

ABSTRACT:
An improved process for the preparation of asymmetrical N-phenyl-N'-substituted para-phenylene diamines by the reductive alkylation of para-nitroso-diphenylhydroxylamine with an aldehyde or a ketone in the presence of hydrogen and a hydrogenation catalyst is disclosed. The improvement comprises utilizing as the hydrogenation catalyst (1) one member selected the group consisting of palladium and platinum sulfide, in an amount less than 1%, by weight, based on the weight of para-nitroso-diphenylhydroxylamine, and (2) activated carbon with a specific surface area of at least 700 square meters per gram and an ash content of less than 7.5%, by weight.

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