Allessa Gmbh

Allessa Chemie Gmbh

Doris Neumann

Joachim Ritzer

Gunther Effenberger

A method is described for the catalytic hydrogenation of aromatic nitro compounds with hydrogen to the corresponding amines in the presence of a supported catalyst comprising platinum. The method is characterized in that the catalyst comprising platinum has been modified with a tungsten compound and with a phosphorus compound in an oxidation state of &#x3c;5. High yields and high selectivities are possible with the method.

Method for hydrogenating nitroaromatic systems with selected platinum catalysts

A method for hydrogenating optionally substituted phenols with one hydroxyl group to cyclohexanones over modified, palladium-comprising supported catalysts. This is possible surprisingly in selected alcoholic solvents with high selectivity. Here it is even possible to recycle the catalysts employed, which hitherto has only been possible with considerable loss of selectivity.

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Offenbach, Germany

Doris Neumann