| abstract |
The invention relates to a process for the preparation of aromatic hydroxyaldehydes, for example vanillin or ethylvanillin. These compounds, which are shown in a chemical process, are used in the production of foodstuffs and in the cosmetics industry. The process is characterized in that arylglycolic acid is subjected to air oxidation with a supported copper-I-oxide supported catalyst in alkaline solution. {Aromatic hydroxyaldehydes; ethyl vanillin; vanillin; Arylglykolsäure; Alpha-keto acid; Cuprous oxide catalyst; Supported catalyst; Fixed bed process; air oxidation; aqueous-alkaline medium} |