Process for the preparation of p-amino-phenols

Details Process for the preparation of p-amino-phenols Process for the preparation of p-amino-phenols

1991-11-26

1996-08-13

Burn, Brian

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

Organic compounds

Amino nitrogen containing

564417, 564423, 564428, C07C20922

Patent

active

055457541

ABSTRACT:
p-Amino-phenols are advantageously prepared by catalytic hydrogenation of the aromatic nitro compounds on which they are based in a reaction medium of aqueous sulphuric acid in the sense of a Bamberger rearrangement at elevated temperature by a procedure in which the reaction medium additionally contains a water-miscible organic solvent.

REFERENCES:
patent: 3637820 (1972-01-01), Dodman et al.
patent: 4307249 (1981-12-01), Derrenbacker
patent: 4625062 (1986-11-01), Nagata et al.
patent: 4885389 (1989-12-01), Lee et al.
173752k: M. Enomoto et al., "Preparation of 4-amino-3-fluorophenol", Chem. Abstr., V. 111, No. 19 (Nov. 1989), p. 688.
55156m: Tanaka et al, "Ring-Substituted p-Aminophenols", Chem. Abstr., V. 86, No. 9 (Feb. 1977) , p. 411.

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