Metallotetraazoporphyrins as oxygen atom transfer and dioxygen activation catalysts

CHED 1190

Andrew T. Stafford, Department of Chemistry, U. S. Naval Academy, 572 Holloway Road, Annapolis, MD 21402 and Jeffrey P. Fitzgerald, fitzgera@usna.edu, Department of Chemistry, U.S. Naval Academy, 572 Holloway Road, Annapolis, MD 21402.
Metallotetraazaporphyrins were studied as oxygenation catalysts for the conversion of alkenes and alkanes into epoxides and alcohols, respectively. Tetraazoporphyrins are planar macrocyclic ligands composed of four pyrrole rings connected to each other by bridging aza nitrogen atoms. Catalytic reactions were monitored by gas chromatography and UV-Vis spectroscopy of the product mixture as a function of time. Catalyst efficiency was studied as a function of the central metal ion, axial ligand, and peripheral substitution on the porphyrazine macrocycle.