Abstract
The oxidation of alcohols with tert-butylhydroperoxide (TBHP), in the presence of immobilized Co 2+ complexes with ligands of 2,2′-bipyridine (bpy), ethylenediamine (en), acetylacetonate (acac), urea, N, N′-ethylenebis(salicylideneamine) (salen), N, N′-propylenebis(salicylideneamine) (salpn) and N, N′-phenylenebis(salicylideneamine) (salophen) were investigated. It was found that immobilized [Co(bpy) 2] 2+/bentonite is an efficient catalyst for the oxidation of alcohols such as cyclohexanol (91% conversion; 100% selectivity), benzyl alcohol (53% conversion; 100% selectivity) and hexanol (40% conversion; 100% selectivity). Effect of reaction time, effect of the amount of Co 2+ in catalyst and the effect of type of substrates and oxidants in this catalysis systems were investigated. In the best conditions, TBHP is more efficient oxidant with respect to H 2O 2 and order has been observed for the percentage of conversions of alcohols: 2° > benzylic > 1°.
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