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The new pentadentate ligand 1,3-bis[N-2-(2'-pyridylethyl)formimidoyl]-2,5-dihydroxybenzene (1) was prepared in five steps from 2,6-dimethylphenol in 21% overall yield. Reaction of 1 with CuII(ClO4)2·6H2O gave the unexpectedly stable hydroquinone-containing binuclear Cu(II) complex [2,6-bis[N-2-(2'-pyridylethyl)formimidoyl]-4-hydroxy-1-phenolato]biscopper(II) bisperchlorate (8). The crystal and molecular structure of 8 was determined by X-ray analysis. The complex crystallizes in the triclinic space group P1, with Z = 2 in a unit cell of the following dimensions: a = 9.399 (2) Å, b = 10.469 (1) Å, c = 14.612 (4) Å, α = 102.72 (2)°, β = 100.71 (2)°, γ = 104.60 (2)°. Surprisingly high reactivity of 8 was observed in catalytic oxidations of hydroquinones and α-hydroxy ketones using molecular oxygen as the oxidant. A mechanistic discussion is provided

Bimetallic oxidation catalysts. Synthesis, x-ray analysis, and reactivity of a binuclear p-hydroquinone-containing copper(II) complex