{This article|This short article} describes the synthesis and reactivity {studies|research} of {three|3} cobalt complexes bearing aminophenol-derived ligands {without|with out|without having|with no|devoid of|without the need of} nitrogen substitution: CoII(tBu2APH){2|two}(tBu2AP){2|two} (1), Co2III(tBu2APH){2|two}(tBu2AP){2|two}(μ-tBu2BAP){2|two} ({2|two}), and CoIII(tBu2AP){3|three} ({3|three}) (tBu2APH = 2-amino-4,6-di-tert-butylphenol, tBu2AP = 2-amino-4,6-di-tert-butylphenolate, μ-tBu2BAP = bridging 2-amido-4,6-di-tert-butylphenolate). Stoichiometric reactivity {studies|research} {of these|of those} well-defined complexes demonstrate the catalytic com-petency of {both|each} CoII and CoIII complexes {in the|within the|inside the} aerobic oxidative cyclization of tBu2APH with tert-butyl isonitrile. Reactions with O2 reveal the aerobic oxidation of CoII {complex|complicated} 1 to {generate|produce|create} the CoIII species {2|two} and {3|three}. UV-visible time-course {studies|research} and EPR spectroscopy indicate that this oxidation proceeds {through|via|by means of|by way of} a ligand-based radical intermediate. These {studies|research} repre-sent {the first|the very first|the initial} {example|instance} of well-defined cobalt-aminophenol complexes that {participate in|take part in} catalytic aerobic oxidation reactions and highlight a {key|important|crucial|essential} {role|function|part} {for a|to get a|for any} ligand radical {in the|within the|inside the} oxidation sequence. Buy99116-11-7 5-Hydroxypicolinaldehyde In stock PMID:24257686
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