Process for preparing N-alkyl-substituted aminophenols

Details Process for preparing N-alkyl-substituted aminophenols Process for preparing N-alkyl-substituted aminophenols

1990-08-01

1994-01-04

Hollrah, Glennon H.

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

Organic compounds

Amino nitrogen containing

564395, 564396, 564398, C07C20926

Patent

active

052761932

ABSTRACT:
A process for preparing an N-alkyl-substituted aminophenol is disclosed, comprising continuously feeding an aldehyde or a ketone to a reaction system containing an organic solvent, a catalyst for reduction, hydrogen, and an aminophenol to conduct a reductive alkylation reaction, wherein said reductive alkylation reaction is carried out while continuously adding an organic carboxylic acid into the reaction system. The process attains a high yield even when the catalyst is repeatedly used and does not cause corrosion of equipment.

REFERENCES:
patent: 2380420 (1945-07-01), Emerson
patent: 2776313 (1957-01-01), Lappin
patent: 4233448 (1980-11-01), Bright et al.
patent: 4233458 (1980-11-01), Bright et al.
patent: 4713488 (1987-12-01), Omatsu et al.

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