Catalytic oxidation of organic substrates by transition...

Details Catalytic oxidation of organic substrates by transition... Catalytic oxidation of organic substrates by transition...

C - Chemistry, Metallurgy

07

C

C07C 45/00 (2006.01) C07B 41/00 (2006.01) C07B 41/02 (2006.01) C07B 41/04 (2006.01) C07C 27/00 (2006.01) C07C 27/12 (2006.01) C07C 29/03 (2006.01) C07C 29/50 (2006.01) C07C 37/00 (2006.01) C07C 41/00 (2006.01) C07C 45/34 (2006.01) C07C 46/08 (2006.01) C07C 49/105 (2006.01) C07C 67/00 (2006.01) C07D 301/06 (2006.01) C07D 303/04 (2006.01) C08F 2/46 (2006.01)

Patent

CA 2394014

Improved oxidation methods are provided wherein a reaction mixture comprising a substrate to be oxidized (e.g., phenols, alkenes) and an oxidation catalyst (typically dispersed in an organic solvent system) is supplemented with a compressed gas which expands the reaction mixture, thus accelerating the oxidation reaction. In preferred practice pressurized subcritical or supercritical carbon dioxide is used as the expanding gas, which is introduced into the reaction mixture together with an oxidizing agent. The inventive methods improve the substrate conversion and product selectivity by increasing the solubility of the oxidizing agent in the reaction mixture.

L'invention concerne des techniques d'oxydation améliorées dans lesquelles on ajoute à un mélange réactionnel comprenant un substrat à oxyder (p.ex. phénols, alcènes) et à un catalyseur d'oxydation, généralement dispersé dans un système de solvant organique, un gaz comprimé qui dilate le mélange réactionnel et accélère ainsi la réaction d'oxydation. Dans un mode de réalisation préféré, on utilise du dioxyde de carbone sous-critique ou supercritique comme gaz expansif, introduit dans le mélange réactionnel en même temps qu'un agent oxydant. Les techniques de l'invention permettent d'améliorer la transformation du substrat et la sélectivité du produit au moyen de l'augmentation de la solubilité de l'agent oxydant dans le mélange réactionnel.

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