Process for preparing arylic esters of carboxylic acids

• Main Author: KNIPS, ULRICH
• Format: Patent
• Language: English; French; German
• Published: 26.11.1980
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM; APPARATUS THEREFOR; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; GENERAL METHODS OF ORGANIC CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

Die Erfindung betrifft ein Verfahren zur Herstellung von Carbonsäurearylestern durch katalytische Zersetzung der entsprechenden Monoarylthalliumsalze unter Erhaltung des Substitutionsmusters des Arylrestes nach Art einer Dethallierungsreaktion. Die Reaktion erfolgt in wäßriger Lösung in Gegenwart katalytischer Mengen von Palladiumsalzen. Die Arylester können aus der wäßrigen Phase in bekannter Weise abgeschieden werden. 1. A process for the preparation of aryl esters of organic carboxylic acids in isomeric purity comprising decomposing a compound of the general formula Ar-TIXY wherein Ar is a mono- or polycyclic aryl radical or a mono- or polycyclic heteroaryl radical and X and Y are either identical or different acyloxy radicals or organic carboxylic acids or X is an acyloxy radical of an organic carboxylic acid and Y is an anion of a strong mineral acid, in pure water or in an aqueous solvent in the presence of catalytic amounts of palladium salts under mild conditions and separating the resulting aryl esters in a known manner from the aqueous phase or extracting them with solvents.