IMPROVED METHOD FOR MANUFACTURING 2,2'-BIPYRIDINE-4,4'-DICARBOXYLIC ACID

摘要

The present invention improved the production of 2,2'-bipyridine-4,4'-dicarboxylic acid relates to a method. The production method of the present invention is Pd-C by the ethyl isopropyl nicotinate (3) a catalyst for the dehydrogenation coupling reaction conditions, 2,2'-bipyridyl-4,4'-dicarboxylic acid diethyl ester (2) synthesized, and this is done by hydrolysis, and then acidified to the desired compound of 2,2'-bipyridine-4,4'-dicarboxylic acid (1) for recovering the process, conventional dehydrogenation due to the high price of the ruthenium-based catalyst Instead of performing the coupling reaction, and is carried out in an optimal condition under Pd-C catalyst reaction conditions to provide an environment-friendly production process to eliminate the problem after treatment using a strong oxidizing agent and sulfuric acid according to a conventional process. Depending on the production method of the present invention, the process can prepare compounds of a high yield at the same time it can be used to simplify the production process economically advantageous for mass production. Furthermore, it is possible to provide a dye-sensitized solar cell containing the dye in high yield and high purity of the 2,2'-bipyridine-4,4'-dicarboxylic acid obtained from the production process of the present invention as a ligand.