Dsm IP Assets B.v.

Arkema France

Symrise Ag

Grunenthal Gmbh

Fuchs Petrolub Ag

Wolfgang Hölderich

Werner Bonrath

Jean-Luc Dubois

Reinhard Karge

Utz-Peter Jagusch

Jan Schütz

Rolf Luther

Theo Mang

Jean-Francois Eckhard

Patrick Weckes

Jutta Fischer

Ulrich Keller

Michael H Valkenberg

Ramona Hinze

Manfred L Eggersdorfer

Erhard Henning Fleischhauer

Bernhard Markus Ernst Russbüldt

Verena Ritzerfeld

Monika Wissler

Use of pure lanthanum oxide which is obtained by calcination of oxygen-containing lanthanum salts at temperatures of at least 700&#xb0; C. as heterogeneous catalyst in the aldol condensation of citral and acetone to give pseudoionone, and process for the preparation of pseudoionone by aldol condensation of citral and acetone in the liquid phase using pure lanthanum oxide.

Process for preparing pseudoionone

The invention relates to a process of reacting a primary allylic alcohol with a compound containing a) a metal selected from the group consisting of Ag, Au, Ce, Mn, Ni, Ru, Re, Zn and Co preferably Ag and b) an oxidant like TEMPO (2,2',6,6&#x2032;-tetra-methylpiperidin-1-oxyl) or its derivates and c) a co-oxidants selected from the group of peroxodisulfates (PDS), HSO, HO, NaOCl, O, KOCl, and air.

Primary allylic alcohol and Ag

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Frankenthal, Germany

Wolfgang Hölderich