Basf Aktiengesellschaft

Lothar Laupichler

Karl-Heinz Etzbach

Gerhard Wagenblast

Karl Siemensmeyer

Manfred Stroezel

Volkmar Vill

Bernhard Bockstiegel

Heinz Etzrodt

Paul Delavier

Klaus Reimer

Gerd Kaibel

Andreas Ansmann

Hagen Jaedicke

Paul Knochel

Carsten Oost

Mathias Haake

Dietmar Weller

Franz Josef Br&ouml;cker

Ulrich Kammel

Falk Langer

Preparation of C10-C30-alkenes by partial hydrogenation of alkynes over fixed-bed supported palladium catalysts

A process for preparing .gamma.,.delta.-unsaturated ketones of the general formula I ##STR1## by reacting an allyl alcohol of the general formula II ##STR2## in which R.sup.1 is H or a hydrocarbon radical having 1 to 20 carbon atoms, with diketene or an alkyl acetoacetate of the general formula III ##STR3## in which R.sup.2 is alkyl having 1 to 4 carbon atoms in an unmodified or modified Carroll reaction in the presence of an aluminum catalyst, wherein aluminum compounds which are stable liquids at room temperature, or a mixture of such aluminum compounds, which comprise at least one radical formed from an alkyl acetoacetate and 1 or 2 alkoxy radicals, or else comprise exclusively radicals formed from alkyl acetoacetates, which are esterified with sec-butanol or isobutanol, or else are esterified with at least two different alcohols, are used as aluminum catalyst. Also claimed are the novel mixtures of aluminum compounds which comprise radicals which are formed exclusively from alkyl acetoacetates and are esterified with at least two different alkanols, and the batchwise and continuous preparation of the liquid aluminum catalysts.

Preparation of .gamma.,.delta.-unsaturated ketones by the Carroll

The invention relates to chiral compounds containing at least one divalent or polyvalent chiral group, at least one polymerizable group, at least one spacer and at least one mesogenic group, and to their use as polymerizable, chiral dopes for the preparation of cholesteric networks. The novel compounds are suitable for use in electro-optical displays or as chiral dopes for nematic or cholesteric liquid crystals in order to produce layers which reflect in colors.

Polymerizable, chiral compounds and their use

Optically active phosphines of the general formula I or II ##STR1## where the variables have the following meanings: X is an optically active terpene radical,

Optically activate phosphines,their preparation and their metal

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Heidelberg, Germany

Lothar Laupichler