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a-methylstyrene
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Solvent-free oxidation of cumene by molecular oxygen catalyzed by cobalt salen-type complexes
, Article Research on Chemical Intermediates ; Volume 38, Issue 3-5 , 2012 , Pages 871-883 ; 09226168 (ISSN) ; Ferdosi, S. R ; Tafazolian, H ; Sharif University of Technology
Abstract
Co(salen)-type [where salen = di-(salicylal)-ethylenediimine] complexes were shown to be efficient catalysts in the oxidation of 2-phenylpropane (cumene) by dioxygen primarily to 2-phenyl-2-propanol (cumyl alcohol), 2-phe-nylpropene (a-methylstyrene), and 1-phenylethanone (acetophenone) applying 1H NMR spectroscopy and gas chromatography-mass spectrometry (GC-MS). The effect of substitution on the ligand was also monitored in both oxygen-absorption and the catalytic reaction. Based on these results, the trend observed for the production of a-methylstyrene and cumyl alcohol were parallel to dioxygen uptake by the catalyst in neat cumene, while acetophenone productions obeyed a non-linear...