Preparing (1S,5S)-2,6-dioxabicyclo-(3.3.0)-octan-4,8-dione, comprises oxidizing dianhydrohexitols or their corresponding hydroxy ketones with oxygen-containing gas in the presence of catalyst composition containing e.g. a nitroxyl radical

摘要

Preparing (1S,5S)-2,6-dioxabicyclo-(3.3.0)-octan-4,8-dione, comprises oxidizing dianhydrohexitols or their corresponding hydroxy ketones with an oxygen-containing gas in the presence of a catalyst composition containing at least one nitroxyl radical, at least one nitric oxide source and at least one carboxylic acid or its anhydrides and/or mineral acid or its anhydrides, optionally in the presence of at least one solvent, where the reaction is carried out without the addition of halogen sources.