Basf Se Corporation

Basf Aktiengesellschaft

Günter Wegner

Georg Seeber

Rocco Paciello

Oliver Bey

Gunnar Heydrich

Andreas Keller

Martin Haubner

Mathias Schelwies

Gerd-Dieter Tebben

Hartwig Fuchs

Stephanie Renz

Gerd Kaibel

Werner Aquila

Torsten Mäurer

Joachim Paust

Hansgeorg Ernst

Walter Dobler

Manfred Stroezel

Till Gerlach

Signe Unverricht

Wolfgang Krause

Udo Rheude

Thorsten Johann

Franz Josef Brocker

Bernhard Schulz

Wolfram Burst

Heinz Etzrodt

Tobias Rosendahl

Radwan Abdallah

J&ouml;rg Therre

Hans-Georg Göbbel

Stefan Bauer

Peter Munster

Axel Salden

Martin Kamasz

Otto Worz

Arno Kochner

Armin Bertram

Gunter Dauwel

Peter Löchner

Rocco Pacielo

Peter LÖCHER

The present invention relates to a process for the preparation of an optically active carbonyl compound by asymmetric hydrogenation of a prochiral &#x3b1;,&#x3b2;-unsaturated carbonyl compound with hydrogen in the presence of at least one optically active transition metal catalyst that is soluble in the reaction mixture and which has rhodium as catalytically active transition metal and a chiral, bidentate bisphosphine ligand, wherein the reaction mixture during the hydrogenation of the prochiral &#x3b1;,&#x3b2;-unsaturated carbonyl compound additionally comprises at least one compound of the general formula (I):

Method for synthesizing optically active carbonyl compounds

The present invention relates to a process for the preparation of an optically active carbonyl compound by asymmetric hydrogenation of a prochiral &#x3b1;,&#x3b2;-unsaturated carbonyl compound with hydrogen in the presence of at least one optically active transition metal catalyst that is soluble in the reaction mixture and which has rhodium as catalytically active transition metal and a chiral, bidentate bisphosphine ligand, wherein the reaction mixture during the hydrogenation of the prochiral &#x3b1;,&#x3b2;-unsaturated carbonyl compound additionally comprises at least one compound of the general formula (I): 

The present invention relates to a process for the preparation of an optically active carbonyl compound by asymmetric hydrogenation of a prochiral &#x3b1;,&#x3b2;-unsaturated carbonyl compound with hydrogen in the presence of at least one optically active transition metal catalyst that is soluble in the reaction mixture and which has rhodium as catalytically active transition metal and a chiral, bidentate bisphosphine ligand, wherein the reaction mixture during the hydrogenation of the prochiral &#x3b1;,&#x3b2;-unsaturated carbonyl compound additionally comprises at least one compound of the general formula (I): in which

The use of a supported noble metal catalyst obtainable by applying a sparingly soluble noble metal compound to a support from solution or suspension, and subsequently treating thermally, for preparing olefinically unsaturated carbonyl compounds.

Use of a supported catalyst containing precious metal for oxidative dehydrogenation

Supported noble metal-comprising catalysts which can be obtained by

Supported noble metal comprising catalyst for oxidative dehydrogenation or epoxidation

A process is described for selectively hydrogenating citronellal to citronellol in which a liquid phase, in which the citronellal is dissolved and particles of a catalyst are suspended which is capable of preferentially hydrogenating carbon-oxygen double bonds over carbon&#x2014;carbon double bonds, is conducted through a device which inhibits the transport of the catalyst particles in the presence of a hydrogen-containing gas.

Method for continuous hydrogenation of citronellal to form citronellol

3,7-Dimethyl-2,6-octadien-1-al of formula I is prepared continuously by:

Preparation of citral

The invention relates to a process for the selective liquid-phase hydrogenation of .alpha.,.beta.-unsaturated carbonyl compounds of the formula I, ##STR1## where R.sub.1 is hydrogen or an organic radical, and R.sub.2, R.sub.3 and R.sub.4, independently of one another, are hydrogen or a C.sub.1 -- to C.sub.4 --alkyl group, to saturated carbonyl compounds of the formula II ##STR2## using hydrogen in the presence of a pulverulent palladium and/or rhodium catalyst and in the presence of an organic base. The process is carried out in a packed bubble column reactor (1, 2) with product recycling (11, 17) and circulating hydrogen gas (4, 15, 16). It is particularly suitable for the selective hydrogenation of citral to citronellal.

Selective liquid-phase hydrogenation of .alpha.,.beta.-unsaturated

A process for preparing polyenecarbonyl compounds having a high all-E content and their acetals or ketals by aldol condensation or Horner-Emmons reaction comprises carrying out the reaction, for the purposes of the preferred formation of a double bond of E configuration and in order to maintain the E configuration of the double bonds in the stating compounds as completely as possible, in the presence of oxygen or an oxygen-inert gas mixture or nitric oxide or a nitric oxide-inert gas mixture and/or in the presence of specific stable radicals and/or in the presence of quinones or quinone derivatives.

Preparation of polyenecarbonyl compounds having a high content of the

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Römerberg, Germany

Günter Wegner