Method for the preparation of 2,6-naphthalene dicarboxylic acid

Details Method for the preparation of 2,6-naphthalene dicarboxylic acid Method for the preparation of 2,6-naphthalene dicarboxylic acid

1986-08-12

1988-08-16

Shippen, Michael L.

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

Organic compounds

Carboxylic acids and salts thereof

562413, 562421, C07C 51255

Patent

active

047646381

ABSTRACT:
Disclosed is a method for the preparation of 2,6-naphthalene dicarboxylic acid from 2-acyl-6-alkyl naphthalene, especially 2-acetyl-6-methylnaphthalene, by oxidation in two steps with oxygen or air. The catalyst in the first oxidation is based on manganese. The catalyst in the second oxidation is based on cobalt with bromine added. The addition of 6-alkyl-2-naphthoic acid to the reaction in the second oxidation, in portions or in a continuous manner, results in very good yields having high purities.

REFERENCES:
patent: 3856855 (1974-12-01), Yamashita et al.
patent: 4665215 (1987-05-01), Davenport

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