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The major emphasis of our current investigations involves the synthesis of porphyrin analogues with exotic subunits such as azulene, benzene, naphthalene, indene, cyclopentadiene, cycloheptatriene, pyridine or pyrazole replacing one or more of the usual pyrrole rings. These studies provide new insights into the nature of aromaticity in these "[18]annulenes of nature" and have resulted in the discovery of remarkable new chemistry. For instance azuliporphyrins have been shown to readily form stable organometallic derivatives with nickel(II), palladium(II), platinum(II), iridium(III) and rhodium(III), whereas copper(II) salts give rise to a regioselective oxidation at the internal carbon. In contrast, benzocarbaporphyrins act as trianionic organometallic ligands, generating stable silver(III) and gold(III) derivatives. Benzocarbaporphyrins also react with ferric chloride in alcohol solvents to give carbaporphyrin ketals with strong long wavelength absorptions that make these structures good candidates as superior photosensitizers for applications in PDT. In addition, carbaporphyrin ketals show some promise in the treatment of leishmaniasis. Another carbaporphyrinoid system synthesized by our research group is oxybenziporphyrin, and this acts as both a dianionic or a trianionic ligand generating palladium(II), platinum(II), copper(III), silver(III) and gold(III) complexes. New methodologies are also being developed to synthesize dicarbaporphyrinoid systems that exhibit equally exciting reactivity.
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Rachel A Tomlovich,Timothy D Lash
The Journal of organic chemistryno. 1 (2023): 124-140
TETRAHEDRON (2023): 133601-133601
JOURNAL OF ORGANIC CHEMISTRYno. 1 (2023): 124-140
Fundamentals of Porphyrin Chemistrypp.385-451, (2022)
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