| abstract |
Process for the continuous production of aromatic aldehydes of the general formula (1) in which Ar represents an aryl radical of 6 to 14 carbon atoms, R¹, R² and R³ independently of one another denote hydrogen, fluorine, chlorine or bromine atoms by using a dichloromethyl-substituted aromatic of the general formula (2) in which Ar, R¹, R², R³ have the meanings given above, with an aqueous solution of one or more catalysts of the general formula (3) MX n (3) in which M is a transition metal from the series iron, nickel, copper, chromium, thallium, zinc and mercury, X is F, Cl, Br, I, OH, SO₄, PO₄ or NO₃, and n depending on the oxidation state of Transition metal M is the number 1, 2, 3 or 4, a concentration of about 1 to about 50%, based on the weight of the water of the catalyst solution, continuously hydrolyzed at temperatures from about 70 ° to about 160 ° C. |