title: Iron(III) Fluorinated Porphyrins: Greener Chemistry from Synthesis to Oxidative Catalysis Reactions.
abstract: Iron(III) fluorinated porphyrins play a central role in the biomimetics of heme enzymes and enable cleaner routes to the oxidation of organic compounds. The present work reports significant improvements in the eco-compatibility of the synthesis of 5,10,15,20-tetrakis-pentafluorophenylporphyrin (H₂TPFPP) and the corresponding iron complex [Fe(TPFPP)Cl], and the use of [Fe(TPFPP)Cl] as an oxidation catalyst in green conditions. The preparations of H₂TPFPP and [Fe(TPFPP)Cl] typically use toxic solvents and can be made significantly greener and simpler using microwave heating and optimization of the reaction conditions. In the optimized procedure it was possible to eliminate nitrobenzene from the porphyrin synthesis and replace DMF by acetonitrile in the metalation reaction, concomitant with a significant reduction of reaction time and simplification of the purification procedure. The Fe(III)porphyrin is then tested as catalyst in the selective oxidation of aromatics at room temperature using a green oxidant (hydrogen peroxide) and green solvent (ethanol). Efficient epoxidation of indene and selective oxidation of 3,5-dimethylphenol and naphthalene to the corresponding quinones is observed.
authors.affiliation: REQUIMTE/LAQV, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal. susana.rebelo@fc.up.pt.
authors.forename: Susana L H
authors.initials: SL
authors.lastname: Rebelo
authors.affiliation: REQUIMTE/UCIBIO, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal. andre.silva@fc.up.pt.
authors.forename: André M N
authors.initials: AM
authors.lastname: Silva
authors.affiliation: REQUIMTE/UCIBIO, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal. craig.medforth@fc.up.pt.
authors.forename: Craig J
authors.initials: CJ
authors.lastname: Medforth
authors.affiliation: REQUIMTE/LAQV, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal. acfreire@fc.up.pt.
authors.forename: Cristina
authors.initials: C
authors.lastname: Freire
mesh_terms: D032701:Biomimetics; D002384:Catalysis; D055772:Green Chemistry Technology; D054879:Halogenation; D006418:Heme / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry; D007501:Iron / Q000737:chemistry*; D008665:Metalloporphyrins / Q000138:chemical synthesis* / Q000737:chemistry; D010084:Oxidation-Reduction; D011166:Porphyrins / Q000138:chemical synthesis* / Q000737:chemistry; D012997:Solvents / Q000737:chemistry
chemical_list: D008665:Metalloporphyrins; D011166:Porphyrins; D012997:Solvents; D006418:Heme; D006861:Hydrogen Peroxide; D007501:Iron
keywords: aromatics; catalysis; green oxidation; iron(III)porphyrin synthesis; microwave