| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5278910 | Tetrahedron Letters | 2011 | 4 Pages |
An oxidation method using dilute nitric acid solutions under solvothermal conditions has been developed to synthesise a series of polypyridine-polycarboxylic acids. It has been successfully applied to a range of methyl substituted polypyridines including symmetrical and asymmetrical 2,2â²-bipyridines; 2,2â²:6â²,2â³-terpyridines and; 2,2â²:6â²,2â³:6â³,2â´-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.
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