Process for the preparation of 2-hydroxynaphthalene-6-carboxylic

Details Process for the preparation of 2-hydroxynaphthalene-6-carboxylic Process for the preparation of 2-hydroxynaphthalene-6-carboxylic

1994-09-13

1998-09-15

Killos, Paul J.

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

Organic compounds

Carboxylic acids and salts thereof

562467, C07C 5110

Patent

active

058081429

ABSTRACT:
A process for the preparation of 2-hydroxynaphthalene-6-carboxylic acid using potassium carbonate and CO at temperatures above 260.degree. C. and at a pressure of at least 10 bar comprises using 2-hydroxynaphthalene-3-carboxylic acid and/or 2-hydroxynaphthalene-3,6-dicarboxylic acid and/or their potassium salts and, if desired, potassium .beta.-naphtholate as starting materials.
The process according to the invention enables a considerable increase, by reusing the secondary products, in the product selectivity with regard to 2-hydroxy-naphthalene-6-carboxylic acid.

REFERENCES:
patent: 3655744 (1972-04-01), Yatsuhara et al.
patent: 3718690 (1973-02-01), Bushiere et al.
patent: 4239913 (1980-12-01), Ueno et al.
patent: 4329494 (1982-05-01), Montgomery
patent: 4345094 (1982-08-01), Mueller et al.
patent: 4374262 (1983-02-01), McGinnis
patent: 4393191 (1983-07-01), East
patent: 5011984 (1991-04-01), Ueno et al.

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