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The preparation and oxygenation of Co II (salen) complexes 2a-d whose ethanediyl moieties carry an ω-hydroxyalkyl pendant arm is reported. Air oxidation of 2a gives bridged (alkoxo)Co III (salen) complex 1a with a planar salen ligand. Upon aeration of 2b in MeOH, monomeric bridged complex 1b with a planar salen ligand precipitates, whereas in CH 2 Cl 2 ...
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