Symrise Gmbh & Co Kg

Haarmann & Reimer Gmbh

Symrise Ag

Werner Marks

Walter Kuhn

Oskar Koch

Erich Dilk

Stefan Lambrecht

Peter Esser

Thomas Thielmann

Norbert Richter

Klaus Zahlmann

Jared Klein

Hans-Juergen Topp

The invention relates to an improved method for the preparation of 11(12)-pentadecen-15-olides.

Method for the preparation of 11(12)-pentadecen-15-olides

Process for the preparation of 1-hydroperoxy-16-oxabicyclo[10.4.0]hexadecane (DDP-OOH), wherein 13-oxabicyclo[10.4.0]hexadec-1(12)-ene (DDP) and hydrogen peroxide are reacted in a diluent in the presence of a strong acid, the diluent has a pKa value of greater than or equal to 4.5 and the strong acid has a pKa value of less than or equal to 1.5, wherein after the reaction has taken place, the strong acid is neutralized with at least 0.9 molar equivalent of a base.

Process for the preparation of 1-hydroperoxy-16-oxabicyclo[10.4.0]hexadecane

The invention relates to a method of producing alkoxycinnamic acid ester (alkoxy cinnamate) by condensing C -C acetic acid esters with C -C alkoxybenzaldehyde in the presence of an alkaline and/or alkaline earth C -C alcohalate and removing the C -C alcohol that is produced by this reaction from the reaction mixture.

Method of producing alkoxycinnamic acid ester

In the preparation of substituted 2-cyanocinnamic esters by the Knoevenagel condensation of cyanoacetic esters and carbonyl compounds, the reaction times for obtaining high yields can be considerably reduced by using C.sub.3 -C.sub.6 -monocarboxylic acids and ammonium compounds as catalysts.

Process for preparing substituted 2-cyanocinnamic esters

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