FREMGANGSMAADE TIL FREMSTILLING AF ARYLGLYOXYLSYRER

Process for the preparation of an arylglyoxylic acid of the formula Ar-CO-COOH, wherein Ar is optionally substituted aryl, which process comprises oxidizing the corresponding arylethane-1,2-diol of the formula (I), with oxygen or a gas containing molecular oxygen, in an aqueous alkaline medium and i...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	WEDEMEYER, KARLFRIED, FIEGE, HELMUT
Format:	Patent
Sprache:	dan
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS 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
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	Process for the preparation of an arylglyoxylic acid of the formula Ar-CO-COOH, wherein Ar is optionally substituted aryl, which process comprises oxidizing the corresponding arylethane-1,2-diol of the formula (I), with oxygen or a gas containing molecular oxygen, in an aqueous alkaline medium and in the presence of a platinum-group metal catalyst and, as an activator, a material selected from lead, lead compounds, bismuth and bismuth compounds, at a temperature of up to the boiling point of the reaction mixture; e.g. phenylglyoxylic acid is produced from phenylethane-1,2-glycol preferably using platinum activated with lead, bismuth, or compounds thereof.