Patent ID: 6080892
Filing Date: 2000-06-27
Classification: C07C

Abstract:
A method of producing a benzaldehyde of the formula (I) ##STR3## wherein R.sup.1, R.sup.2, and R.sup.3 are the same or different and represent hydrogen or C.sub.1 -C.sub.4 alkyl or any two of R.sup.1, R.sup.2, and R.sup.3 may be fused together to form a cycloalkyl ring system; andwhich method comprises the reaction between a substituted benzene of the formula (II) ##STR4## wherein R.sup.1, R.sup.2, and R.sup.3 are the same or different and represent hydrogen or C.sub.1 -C.sub.4 alkyl or any two of R.sup.1, R.sup.2, and R.sup.3 may be fused together to form a cycloalkyl ring system; andwherein at most one of R.sup.1, R.sup.2, and R.sup.3 is hydrogen, and a carbon monoxide atmosphere having a pressure from about 20 to 230 psig, in the presence of a metal halide, an acid selected from the group consisting of HCl, HBr, HF, HI, and mixtures thereof, and at least one solvent other than a substituted benzene of the formula (II);wherein the acid is present in a catalytic amount of from about 0.0001 to about 0.01 moles per moles of the metal halide; andwherein the reaction temperature is from about -20.degree. C. to about 25.degree. C.