Process of conversion of pyridine 2,3-dicarboxylic acid...

Details Process of conversion of pyridine 2,3-dicarboxylic acid... Process of conversion of pyridine 2,3-dicarboxylic acid...

C - Chemistry, Metallurgy

07

D

C07D 491/048 (2006.01) C07D 213/80 (2006.01) C07D 491/04 (2006.01)

Patent

CA 2089136

ABSTRACT OF THE DISCLOSURE In one embodiment this invention provides a process for converting a pyridine-2,3-dicarboxylic acid diester to the corresponding cyclic anhydride directly, without any recovery and purification of the pyridine- 2,3-dicarboxylic acid intermediate. An important aspect of the invention process is the utility of pure pyridine- 2,3-dicarboxylic acid diester starting matter. A procedure for providing pure diester starting material is demonstrated.

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