Patent ID: 6300525
Filing Date: 2001-10-09
Classification: C07C,C07D

Abstract:
A method of producing a benzaldehyde of the formula (I) ##STR3##wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, and R.sub.5 are selected from hydrogen, lower alkyl groups containing 1-4 carbon atoms, cycloalkyl or cycloalkylene ring systems, fluorine, chlorine; with the proviso that only one of R.sub.1, R.sub.2, R.sub.3, R.sub.4, and R.sub.5 is fluorine or chlorine: which comprises contacting a substituted benzene of formula (II) ##STR4##wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, and R.sub.5 are selected from hydrogen, lower alkyl groups containing 1-4 carbon atoms, cycloalkyl or cycloalkylene ring systems, fluorine, chlorine; with the proviso that only one of R.sub.1, R.sub.2, R.sub.3, R.sub.4, and R.sub.5 is fluorine or chlorine, in a carbon monoxide atmosphere having a pressure from about 200-800 psig, all in the presence of a metal halide, an acid selected from the group consisting of HCl, HBr, HF, HI, and mixtures thereof; wherein the acid is present in a catalytic amount of from about 0.005 to about 0.01 moles per moles of the metal halide; and wherein the reaction temperature is from about 30.degree. to 100.degree. C.