Method for preparing ketones by pyrogenic reaction of aldehydes, alcohols, acids or esters

The invention relates to an improved catalytic process for preparing ketones by pyrogenation starting from the corresponding acids, alcohols, aldehydes or esters, employing temperatures of between 250 and 500° C. According to this process the pyrogenation reaction is conducted in liquid phase. The invention concerns a method for preparing ketones of formula (I) wherein A and B are as defined in claim 1, consisting of reacting at a temperature ranging between 250 and 500° C. a compound of formula (II): A-X with a compound of formula (III): B-Y, wherein A, B, X and Y are as defined in claim 1, in a coolant solvent having a boiling point higher than 250 ° C., in the presence of a catalyst comprising at least a chemical compound of an element selected among alkali, alkaline-earth metals, lanthanides, Si, Al, Zn, Cu, Co, Fe, Mo, Mn, Cr, V, T, Zr, U, Rh, Tl, Ag, Cd, Pb, Y, Sc and Th, wherein the element is in divalent state or has a higher valency