Method for the production of alpha,beta-unsaturated ketones

• Main Authors: SCHNEIDER, KURT, HOELDERICH, WOLFGANG, HUPFER, LEOPOLD
• Format: Patent
• Language: English; French; German
• Published: 06.04.1988
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

Die Anmeldung betrifft ein Verfahren zur Herstellung von alpha,beta-ungesättigten Ketonen der Formel (I) in der R¹, R², R³ Wasserstoff, Alkyl-, Alkenyl- mit 1 bis 12 Kohlenstoffatomen, Cycloalkyl-, Aryl-, Aralkyl- bzw. Alkylarylreste durch Umsetzung der entsprechenden α-Oxy, Alkoxy oder Carboxyverbindungen in Gegenwart von sauren Katalysatoren. Bevorzugte Ausgangsstoffe sind 3-Methyl-3-hydroxy-butan-2-on, 3-Methyl-3-hydroxy-pentan-2-on und 3-Pentamethylen-3-hydroxy-propan-2-on, bevorzugte Katalysatoren Zeolithe des Pentasiltyps. Alpha,beta-unsaturated ketones of the formula (I) (I) where R1, R2 and R3 are each hydrogen, alkyl, alkenyl of 1 to 12 carbon atoms, cycloalkyl, aryl, aralkyl or alkylaryl, are prepared by converting the corresponding alpha -hydroxy, alkoxy or carboxy compound in the presence of an acidic catalyst. Preferred starting materials are 3-methyl-3-hydroxy-butan-2-one, 3-methyl-3-hydroxypentan-2-one and 3-pentamethylene-3-hydroxypropan-2-one, and preferred catalysts are zeolites of the pentasil type.