Collman, James P.; Chien, Allis S.; Eberspacher, Todd A.; Zhong, Min; Brauman, John I. published the article 《Competitive Reaction of Axial Ligands during Biomimetic Oxygenations》. Keywords: pyridine axial ligand oxidation metalloporphyrin biomimetic oxygenation; oxidation catalyst iron porphyrin pyridine tail; biomimetic oxygenation competitive oxidation axial ligand.They researched the compound: 3-Pyridinepropionic acid( cas:3724-19-4 ).Computed Properties of C8H9NO2. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:3724-19-4) here.
Nitrogenous bases have commonly been employed as axial ligands for metalloporphyrins in biomimetic model compounds and catalytic oxygenation chem. The addition of bases such as pyridines or imidazoles to metalloporphyrin-catalyzed hydrocarbon oxidation reactions is known to affect catalyst selectivity and turnover rate; this effect was correlated with the electron-donor ability of the ligand. The role of pyridine in these reactions is far more involved than that of a simple axial ligand: pyridine is a competitive substrate and is converted in high yield to the N-oxide. Subsequently, both of these species act as ligands to the metal center. Thus, catalytic systems containing oxidizable pyridines involve complex equilibrium with multiple forms of ligated catalyst, and kinetic results should be interpreted with caution. Alternatives to free pyridine were tested, including a pyridine tail which is covalently attached to the porphyrin.
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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem