Possible mechanism for the formation of KA oil, CHHP, acids and esters via the oxidation of cyclohexane with molecular oxygen using VAlPO4 as a catalyst. KA oil: cyclohexanol and cyclohexanone; CHHP: cyclohexyl hydroperoxide; acids: C4–C6 diacids; esters: synthesized by the reaction of C4–C6 diacids and cyclohexanol