The Reaction of μ‐η 2 :η 2 ‐Peroxo‐ and Bis(μ‐oxo)dicopper Complexes with Flavonol

The [Cu 2 (μ‐O) 2 ] 2+ and [Cu 2 (μ‐η 2 :η 2 ‐ O ) 2 ] 2+ motifs with coordinated N , N,N ‐tribenzyl‐1,4,7‐triazacyclononane and N , N,N ‐triisopropyl‐1,4,7‐triazacyclononane auxiliary ligands in their reaction with flavonol do not lead to ring scission products of the heterocycle, but the formation of the corresponding (flavonolato)copper( II ) complexes [Cu(fla)(Bz‐TAC)]ClO 4 and [Cu(fla)( i Pr‐TAC)]ClO 4 . The subsequent oxygenolysis of the coordinated flavonolate ligand leads to O ‐benzoylsalicylate at elevated temperature, resulting in the enzyme mimicking products [Cu( O ‐bs)(Bz‐TAC)]ClO 4 , [Cu( O ‐bs)( i Pr‐TAC)]ClO 4 ) as well as carbon monoxide. The X‐ray structures of [Cu(fla)(Bz‐TAC)]ClO 4 , [Cu( O ‐bs)(Bz‐TAC)]ClO 4 , and [Cu( O ‐bs)( i Pr‐TAC)]ClO 4 ) are presented. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)