Process for the production of pyridinecarboxylic acids

Details Process for the production of pyridinecarboxylic acids Process for the production of pyridinecarboxylic acids

1996-05-08

1997-12-23

Northington-Davis, Zinna

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546326, C07D213807

Patent

active

057009449

ABSTRACT:
A process for the production of a pyridinecarboxylic acid by the air-oxidation of an alkylpyridine in a liquid phase, in which the conversion of the alkylpyridine is high, the yield of the pyridinecarboxylic acid is therefore high, the content of impurities in the product is decreased, and unreacted raw material and an oxidation intermediate can be recycled without the adverse effect of accumulation of the catalyst and bromine component, the process comprising oxidizing an alkylpyridine with an oxygen-containing gas in a solvent in the presence of a catalyst formed of a heavy metal salt and a bromine compound, the solvent being a lower aliphatic monocarboxylic acid having a water content of 2 to 15% by weight, or the process comprising the step of catalytically hydrogenating an oxidation reaction mixture or an isolated pyridinecarboxylic acid in the presence of a catalyst of a metal belonging to the group VIII of the periodic table.

REFERENCES:
patent: 3801584 (1974-04-01), Kubo et al.

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