Pyridine-2,3-dicarboxylic anhydride, a key intermediate of the herbicide imazapyr, was synthesized from pyridine-2,3-dicarboxylicacid and anhydride according to the methods in the patents.
The binary and ternary solid complexes of rare earth Eu3+ and La3+ with pyridine-2 , 6-dicarboxylicacid(H2DPC) and 1, 10-phenanthroline are synthesized.
In the acidic aqueous solution of copper sulfate, pyridine-2,3-dicarboxylicacid was synthesized by oxidizing quinoline with sodium chlorate, and the yield of the product could reach 56.4%.