(MnLx)-L-III/t-BuOOH-induced activation of dioxygen for the oxygenation ofcyclohexene

Several manganese (III) complexes ((MnLx)-L-III) in combination with tert-b utyl hydroperoxide (t-BuOOH) activate dioxygen (O-2) to oxygenate cyclohexe ne (c-C6H10) to its ketone, alcohol, and epoxide. The product profiles depe nd on the ligand and solvent matrix. With picolinate (PA), bipyridine (bpy) , or triphenylphosphine oxide (OPPh3) as the ligand in py/HOAc (2:1 molar r atio) dominant product is the ketone [c-C6H8(O)] whereas Schiff-base comple xes produce c-C6H8(O), c-C6H9(OH) and the epoxide in almost equal yields. H owever, in MeCN c-C6H8(O) is the dominant product for all of the complexes. (C) 1999 Elsevier Science B.V. All rights reserved.