Evonik Degussa Gmbh

Michiel Janssen

Thomas Haas

Thomas Tacke

Jan Christoph Pfeffer

Michael Volland

Michael Rimbach

Roger Sheldon

Uwe Dingerdissen

Harald Schmidt

Christian Lettmann

Florian Klasovsky

Stefanie Rinker

Juergen Haberland

Jürgen Haberland

Jan Pfeffer

The invention relates to a method for the oxidation of a primary or secondary alcohol, preferably to form an aldehyde or ketone, comprising the following steps: a) providing a catalyst composition comprising at least one compound containing a nitroxyl radical, at least one NO source, at least one carbon or mineral acid or an anhydride of a carbon or mineral acid; b) producing a reaction mixture by adding at least one primary or secondary alcohol and a gas comprising oxygen and optionally one or more than one solvent to the catalyst composition from step a) or step e); c) incubating the reaction mixture from step b) at a temperature of between 0 and 100&#xb0; C. or at the boiling point of the solvent; d) simultaneously with or subsequent to step c): crystallizing the reaction product; and e) recovering the catalyst composition by removing the crystallized reaction product from the reaction mixture obtained in step d).

Continuously operable method for producing carbonyl compounds by means of a catalyst containing a nitroxyl radical

The invention relates to a method for producing 2,6-dioxabicyclo-(3.3.0)-octane-4,8-dione (I), comprising the oxidation of dianhydrohexitols (II-IV), or of corresponding hydroxy ketones, with an oxygen-containing gas in the presence of a catalyst composition, the reaction proceeding without the addition of halogen sources.

Method for producing 2,6-dioxabicyclo-(3.3.0)-octane-4,8-dione

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The Hague, Netherlands

Michiel Janssen