Process for preparation of hydrazobenzenes by catalytic hydrogen

Details Process for preparation of hydrazobenzenes by catalytic hydrogen Process for preparation of hydrazobenzenes by catalytic hydrogen

1979-07-25

1982-04-20

Hines, Robert V.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

260143, 564309, C07C 8524

Patent

active

043260780

ABSTRACT:
In a process for the hydrogenation of nitrobenzene with hydrogen to hydrazobenzene at temperatures ranging from 40.degree. to 110.degree. C. in the presence of a precious metal catalyst, an aqueous alkaline solution and an organic solvent, the reaction mixture being maintained in turbulent motion, the improvement wherein said nitrobenzene is o-, m- or p-chloronitrobenzene, the reaction is carried out in an organic solvent in which the dichlorohydrazobenzene being formed is readily soluble when warm and difficultly soluble when cold, and that the precious metal catalyst is used in such amount that the weight ratio of chloronitrobenzene used to precious metal catalyst is in the range 1:0.00005-less than 0.0002.

REFERENCES:
patent: 2519673 (1950-08-01), Lecher et al.
patent: 2765301 (1956-10-01), Cashion
patent: 3063980 (1962-11-01), Bloom et al.
patent: 3156724 (1964-11-01), Werner et al.

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