Homogenous and Heterogeneous Catalytic Activity of Azo-Linked Schiff Base Complexes of Mn(II), Cu(II) and Co(II).

Azo linked Schiff-base[L] complexes of Mn(II)( 1), Cu(II)( 2) and Co(II)( 3) obtained by template method, in the reaction of 4-(benzeneazo) salicylaldehyde with 1,2-propanediamine in the present of metal acetate, respectively. Complexes are used as catalyst for oxidation of cyclohexene with tert-butylhydroperoxide (TBHP); oxidation of cyclohexene catalyzed by these complexes gave 2-cyclohexene-1-one and 2-cyclohexene-1-ol as major products. Conversion of cyclohexene achieved was 95-100% with ( 1), ( 2) and ( 3), with selectivity of 57, 92 and 100% for 2-cyclohexene-1-one, respectively. The encapsulated Cu(II) complex (Cu-NaY) catalyzes the oxidation of cyclohexene using TBHP as oxidant in good yield. (Cu-NaY) under optimized reaction condition gave three reaction products. A maximum of 100% conversion of cyclohexene has been achieved where selectivity of 2-cyclohexene-1-one was 83%. Graphical Abstract: [Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]