This work reports the catalytic activity, in homogeneous phase, of transition-metal complexes of the first-row (V (IV), Mn (III), Fe (III) Co (III) and Cu (II)) with biomimetic Schiff base ligands with N2O2 coordination sphere, as well as an N4 (Fe (II)), in the room-temperature oxidation of cyclohexane using environmentally benign reagents: hydrogen peroxide (30wt%) as the oxygen source and acetonitrile as the solvent. Nitric acid is also used as promoter of the ...