Process for the preparation of aromatic or heteroaromatic...

C - Chemistry – Metallurgy – 07 – C

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260/512.1, 260/2

C07C 63/00 (2006.01) C07C 51/10 (2006.01) C07D 213/803 (2006.01) C07D 307/68 (2006.01) C07D 333/04 (2006.01) C07D 333/38 (2006.01)

Patent

CA 1187504

ABSTRACT OF THE DISCLOSURE A process is described for the preparation of (hetero)-aromatic carboxylated compounds of formula (I): Image (I) wherein Ar represents an aromatic nucleus of one or more benzenic rings, which may be (poly)-condensed, or a hetero- aromatic nucleus which may be condensed; Y represents a hydrogen atom, a halogen atom, selected from Cl, Br and I, or a group selected from the alkyl-, alkoxy-, trifluoro- alkyl groups having up to 4 carbon atoms, ester-, aryloxy-, nitrile, amide, acetamide, amine, acyl R"-CO- groups, in which R" represents a hydrocarbyl-, alkyl- or aryl group, and -CH2COOR groups, R represents a hydrogen atom, an alkyl group having up to 4 carbon atoms, or an alkaline or -alkaline earth metal, in which an aromatic halide of formula (II): Y' - Ar - X (II) wherein Ar has the meaning herein above defined, X is a halogen atom selected from Cl, Br and I, and Y' is selected from a -CH2X group and Y, wherein Y has the meaning herein above specified, is reacted with carbon monoxide in a (hydro)-alcoholic solvent and with an acid acceptor compound in the presence of a catalyst system consisting of: (a) a salt of cobalt hydro-carbonyl, or of its precursors, and (b), of a halide of formula (III): R' - X (III) wherein R' represents a group selected from alkyl groups having up to 10 carbon atoms, a benzyl group, a -CH2COOR, -CH2CN, Image , Image , Image and a -CH2-Ar-Y group, wherein Ar and R have the meanings herein above specified, at a substantially atmospheric pressure and at a temperature between 20°C and about 80°C. The products thus obtained find an application in the field of alkyd resins (benzoic acid), of dyestuffs and pigments (naphthoic acid, anthrani- lic acid), etc., and in general as intermediates in the synthesis of chemical products.

417057

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