Manufacture of 2-hydroxy-naphthalene-3-carboxylic acid

Details Manufacture of 2-hydroxy-naphthalene-3-carboxylic acid Manufacture of 2-hydroxy-naphthalene-3-carboxylic acid

1975-02-06

1977-01-11

Morgenstern, Norman

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603453, C07C 5115

Patent

active

040026752

ABSTRACT:
A process for the manufacture of 2-hydroxy-naphthalene-3-carboxylic acid by heating sodium .beta.-naphtholate or a mixture of potassium .beta.-naphtholate and sodium .beta.-naphtholate with nitrogen compounds and/or polyphosphates containing at least 3 phosphorus atoms per molecule to a temperature of at least 180.degree. C, reaction with carbon dioxide and subsequent reaction of the resulting salt with acid. The 2-hydroxy-naphthalene-3-carboxylic acid obtainable by the process of the invention is a starting material for the manufacture of dyes, a coupling component for dye lakes and for chrome dyes, and a developer for diazotizable dyes.

REFERENCES:
patent: 2544881 (1951-03-01), Hodges et al.

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