Process for the preparation 4-chloro-2,5-dimethoxy-aniline

Details Process for the preparation 4-chloro-2,5-dimethoxy-aniline Process for the preparation 4-chloro-2,5-dimethoxy-aniline

1989-06-21

1991-08-20

Raymond, Richard L.

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

Organic compounds

Amino nitrogen containing

C07C20936

Patent

active

050416715

ABSTRACT:
Process for the preparation of 4-chloro-2,5-dimethoxyaniline by catalytic reduction of 4-chloro-2,5-dimethoxynitrobenzene with hydrogen in the liquid phase at an elevated temperature and elevated pressure, which comprises carrying out the reduction at temperatures from about 80.degree. to about 110.degree. C. and under a pressure of about 5 to 50 atmospheres gauge in an aromatic solvent in the presence of a modified platinum-on-carbon catalyst in the presence of about 0.01 to about 0.2 mole of a compound which gives a pH of 8 to 10 in aqueous solution, and in the presence of about 0.1 to about 1.0% by weight of an aliphatic, open-chain, primary, secondary or tertiary amine or a cyclic amine, in each case relative to the amount in moles and weight, respectively, of 4-chloro-2,5-dimethoxynitrobenzene employed.

REFERENCES:
patent: 3145231 (1964-08-01), Kosak
patent: 3803054 (1974-04-01), Habig et al.
patent: 4059627 (1977-11-01), Kritzier. et al.
patent: 4070401 (1978-01-01), Hirai et al.
patent: 4082803 (1978-04-01), Paszthory et al.

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