Process for preparing diphenylamines and catalysts usable for th

Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing

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502326, C07C20922

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active

056250975

ABSTRACT:
The preparation of optionally substituted diphenylamine by reaction of optionally substituted aniline with optionally substituted cyclohexanone using a supported Rh catalyst containing rhodium or a combination of rhodium with another platinum metal from the group of palladium, platinum, ruthenium or iridium and which can additionally contain chromium, manganese, alkali metal and a sulphur compound is described. The catalyst of the invention is prepared from halide-free starting materials. The Rh catalyst is distinguished by a low dependence of the initial selectivity, the selectivity in the run-in state and the running-in time on the conditions of the reductive pretreatment and requires only short running-in times to the optimum state.

REFERENCES:
patent: 4729977 (1988-03-01), Immel et al.
patent: 5196592 (1993-03-01), Immel et al.
patent: 5338885 (1994-08-01), Immel et al.

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