The aerobic oxidation of substituted phenols with the catalytic system M(acac)n/3-methylbutanal/O2 has been investigated. Co(acac)2 and Mn(acac)3 promoted the transformation of 2,6-dimethylphenol and 2,6-di-t-butylphenol into their corresponding diphenoquinones and benzoquinones. In the oxidation of 2,3,6-trimethylphenol, the same catalysts yielded 32–34% of the relevant biphenol. Cu(acac)2 converted 2-naphthol into 1,1′-bi-2-naphthol with 84% yield. Supported Co(II) and Cu(II) complexes have also been used as heterogeneous catalysts for the oxidation of 2,6-di-t-butylphenol and 2-naphthol, respectively.
|Titolo:||Aerobic oxidation of substituted phenols catalysed by metal acetylacetonates in the presence of 3-methylbutanal|
|Data di pubblicazione:||2001|
|Digital Object Identifier (DOI):||10.1016/S1381-1169(00)00437-4|
|Appare nelle tipologie:||1.1 Articolo in rivista|