Two stage process for preparing 2,6-pyridinedicarboxylic acid

Details Two stage process for preparing 2,6-pyridinedicarboxylic acid Two stage process for preparing 2,6-pyridinedicarboxylic acid

1981-07-13

1983-12-06

Rotman, Alan L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546 2, 546327, C07F 1100, C07D21355

Patent

active

044195150

ABSTRACT:
This invention relates to a two stage process for preparing 2,6-pyridinedicarboxylic acid or dipicolinic acid from 2,6-dimethyl-pyridine through oxidation of the latter in an acid environment with hexavalent chromium salts and formation of a molar addition compound between dicarboxylic acid, being formed by oxidation, and chromic anhydride in the first stage, and subsequent hot hydrolysis of the addition product so obtained, thus isolating 2,6-pyridinedicarboxylic acid therefrom in the second stage. The invention also comprises the above mentioned intermediate complex addition compound and the 2,6-pyridinedicarboxylic acid of high purity, obtained by the process according to said invention.

REFERENCES:
patent: 4237301 (1980-12-01), Ghelli et al.
Epstein, Liebig's Ann. d. Chem., 231 (1895), pp. 24-36.
Ladenburg, Liebig's Ann. d. Chem., 247, (1888), pp. 32-41.
Black et al., Journ. Org. Chem., 14 (1949), p. 14.
Soine et al., Journal Ann. Pharm. Ass., 39, (195), p. 421.
Henge, Ber., 67, B (1934), pp. 750-753.
Hodson et al, Jr. Bacteriol., 91(2), (1966), pp. 562-569.
Ghelli et al., Chem. Abstracts, vol. 91, No. 19, 157, 616g, (Nov. 5, 1979), Abstracting Spanish Patent Specification 475546 Pub. 01 Apr. 1979.

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