Method for preparing cyclic ketones
AssigneeAllessa GmbH
InventorsDoris Neumann, Joachim Ritzer, Gunther Effenberger
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Abstract
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.
Claims20
A method for hydrogenating phenols with one hydroxyl group to cyclic ketones by reacting the phenols with hydrogen in the presence of a catalyst in a solution comprising an aliphatic and/or cycloaliphatic alcohol with at least three carbon atoms, wherein a supported catalyst comprising palladium is used, which has been treated prior to use with a neutral or basic salt, and/or wherein the hydrogenation takes place in the presence of a supported catalyst comprising palladium and a neutral or basic salt, with the proviso that the use of catalysts comprising palladium and inorganic sulfur compounds and/or organic sulfur compounds is excluded.
Dependencies are inferred from the claim text.