Kelly, Niamh R. published the artcileA simple and environmentally benign synthesis of polypyridine-polycarboxylic acids, Recommanded Product: 4-(1H-Pyrazol-4-yl)pyridine, the publication is Tetrahedron Letters (2011), 52(9), 995-998, database is CAplus.
An oxidation method using dilute nitric acid solutions under solvothermal conditions has been developed to synthesize a series of polypyridine-polycarboxylic acids. It has been successfully applied to a range of Me substituted polypyridines including sym. and asym. 2,2′-bipyridines; 2,2′:6′,2”-terpyridines and; 2,2′:6′,2”:6”,2”’-tetra-pyridines and yields crystalline polypyridine-polycarboxylic acids in a single step. Simple product recovery through filtration yields a recyclable filtrate. More forcing conditions led to demethylation of the polypyridine ligand most probably via decarboxylation. This simple approach avoids potentially harmful metal-based oxidants and negates any issues associated with the disposal of their resultant (hazardous) waste.
Tetrahedron Letters published new progress about 19959-71-8. 19959-71-8 belongs to pyrazoles-derivatives, auxiliary class Pyrazole,Pyridine, name is 4-(1H-Pyrazol-4-yl)pyridine, and the molecular formula is C8H7N3, Recommanded Product: 4-(1H-Pyrazol-4-yl)pyridine.
Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics