名称:
Oxidation of cyclohexene with tert-butylhydroperoxide and hydrogen peroxide catalysted by Cu(II), Ni(II), Co(II) and Mn(II) complexes of N,N′-bis-(α-methylsalicylidene)-2,2-dimethylpropane-1,3-diamine, supported on alumina
摘要:
New square-planar manganese(II), copper(II), nickel(II) and cobalt(II) complexes of a tetradentate Schiff-base ligand "N,N'-bis-(alpha-methylsalicylidene)-2,2-dimethylpropane-1,3-diamine", H-2[Me(2)salpnMe(2)] have been prepared and characterized by elemental analyses, IR, UV-vis, conductometric and magnetic measurements. The results suggest that the symmetrical Schiff-base is a bivalent anion with tetradentate ONNO donors derived from the phenolic oxygen and azomethine nitrogen. The formulae was found to be [M(Me(2)salpnMe(2))] for the 1:1 non-electrolytic complexes. Alumina-supported metal complexes (ASMC); [M(Me(2)salpnMe(2))]/Al2O3; catalyze the oxidation of cyclohexene with tert-buthylhydroperoxide (TBHP) and hydrogen peroxide. Oxidation of cyclohexene with TBHP gave 2-cyclohexene-1-one, 2-cyclohexene-2-ol and 1-(tert-butylperoxy)-2-cyclohexene whereas, oxidation with H2O2 resulted in the formation of cyclohexene oxide and cyclohexene-1,2-diol. Manganese(II) complex supported on alumina "[Mn(Me(2)salpnMe(2))]/Al2O3" shows significantly higher catalytic activity than other catalysts. (c) 2005 Elsevier B.V. All rights reserved.