The susceptibility to ketonization of oxidized derivatives of n-decane (n-decanol, n-decanal, their equimolar mixtures, n-decyl n-decylate, and 3-hydroxy-2-octyl-dodecanal) in the gas phase at atmospheric pressure over Fe3O4 catalyst was studied. Using those reactants, 10-nonyldecanone was the main product. Condensing n-decanal, n-decyl n-decylate, and 3-hydroxy-2-octyl-dodecanal, ketone is obtained with higher yields than from n-decanol.