Two stage process for preparing 2,6-pyridin- dicarboxylic acid

Details Two stage process for preparing 2,6-pyridin- dicarboxylic acid Two stage process for preparing 2,6-pyridin- dicarboxylic acid

C - Chemistry, Metallurgy

07

D

260/297.95

C07D 213/79 (2006.01) C07D 213/803 (2006.01)

Patent

CA 1108617

ABSTRACT OF THE DISCLOSURE This invention relates to a two stage process for preparing 2,6-pyridin-dicarboxylic 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 hydrolisis of the addition product so obtained, thus isolating 2,6-pyridin-dicarboxylic acid therefrom in the second stage. The invention also comprises the above mentioned intermediate complex addition compound and the 2,6-pyridin- dicarboxylic acid of high purity, obtained by the process according said invention.

316755

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