Process to prepare p-alkyl- and p-arylsulphonylbenzoic acid...

Details Process to prepare p-alkyl- and p-arylsulphonylbenzoic acid... Process to prepare p-alkyl- and p-arylsulphonylbenzoic acid...

C - Chemistry, Metallurgy

07

C

C07C 317/44 (2006.01) C07C 315/04 (2006.01)

Patent

CA 2161219

A process for preparing a compound of formula (I), where R1 is optionally substituted alkyl or phenyl, R2 is COOH, and R3 and R4 are independently selected from hydrogen, halo, haloalkyl, nitro, hydroxy, alkoxy, haloalkoxy or alkoxyalkoxy; which process comprises oxidizing a compound of formula (II), where R1, R3 and R4 ate as defined in relation to formula (I) and R5 is H, halo or C1-4 alkyl with sodium hypochlorite or sodium chlorite in the presence of a catalytic amount of a ruthenium or palladium compound and a phase transfer catalyst in an organic solvent at a pH of 7-11.

Procédé de préparation d'un composé de la formule (I) dans laquelle R<1> représente phényle ou alkyle éventuellement substitué, R<2> représente COOH, et R<3> et R<4> sont indépendamment choisis entre hydrogène, halo, haloalkyle, nitro, hydroxy, alcoxy, haloalcoxy ou alcoxyalcoxy; ce procédé consiste à oxyder un composé de la formule (II), dans laquelle R<1>, R<3> et R<4> sont tels que définis par rapport à la formule (I) et R<5> représente H, halo ou alkyle C1-4, avec du chlorite ou de l'hypochlorite de sodium en présence d'une quantité catalytique d'un composé de ruthénium ou de palladium et d'un catalyseur de transfert de phase, dans un solvant organique et à un pH compris entre 7 et 11.

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