Abstract
The aqua-soluble multinuclear copper(II) compounds [Cu 2( μ-H 2tea) 2{ μ 3-Na 2(H 2O) 4}( μ 6-pma)] n ·10 nH 2O (1) and [O ⊂ Cu 4(tea) 4(BOH) 4][BF 4] 2 ( 2) (H 3tea = triethanolamine, H 4pma = pyromellitic acid) have been applied as efficient catalysts for the mild, selective and clean oxidation of benzyl alcohols to benzaldehydes, which proceeds in sole water as solvent at 50 °C, under atmospheric pressure of air (or O 2) as oxidant, and is mediated by TEMPO radical. Molar yields of benzaldehydes (based on alcohol) up to 99% have been achieved (with a high selectivity). Attractive features of these catalytic systems include the use of organic-solvent-free reaction medium, air or dioxygen as oxidant, and aqua-soluble copper catalysts that are readily available by self-assembly.
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