Complete σ* intramolecular aromatic hydroxylation mechanism through O2 activation by a Schiff base macrocyclic dicopper(I) complex.

Beilstein J Org Chem

Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, Campus de Montilivi, E-17071 Girona, Spain ; Catalan Institute for Water Research (ICRA), H2O Building, Scientific and Technological Park of the University of Girona, Emili Grahit 101, E-17003 Girona, Spain.

Published: April 2013

AI Article Synopsis

  • The study investigates how a specific copper complex, [Cu(I)2(bsH2m)](2+), activates oxygen (O2) to hydroxylate aromatic compounds.
  • Using DFT calculations, the research identifies the step-by-step reaction pathway, starting from the initial interaction with O2 to the final product.
  • Key intermediate species include a superoxo complex and a peroxo-Cu(II) intermediate, leading to the formation of the hydroxylated product through bond cleavage and proton transfer.

Article Abstract

In this work we analyze the whole molecular mechanism for intramolecular aromatic hydroxylation through O2 activation by a Schiff hexaazamacrocyclic dicopper(I) complex, [Cu(I) 2(bsH2m)](2+). Assisted by DFT calculations, we unravel the reaction pathway for the overall intramolecular aromatic hydroxylation, i.e., from the initial O2 reaction with the dicopper(I) species to first form a Cu(I)Cu(II)-superoxo species, the subsequent reaction with the second Cu(I) center to form a μ-η(2):η(2)-peroxo-Cu(II) 2 intermediate, the concerted peroxide O-O bond cleavage and C-O bond formation, followed finally by a proton transfer to an alpha aromatic carbon that immediately yields the product [Cu(II) 2(bsH2m-O)(μ-OH)](2+).

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3628990PMC
http://dx.doi.org/10.3762/bjoc.9.63DOI Listing

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