C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 49/603 (2006.01) C07C 45/34 (2006.01)
Patent
CA 2473941
The present invention relates to an improved process for the preparation of 3,5,5-trimethylcyclohex-2-ene-1,4-dione by oxidation of 3,5,5- trimethylcyclohex-3-en-1-one in the presence of an oxidizing agent and a catalyst system comprising a transition metal complex catalyst, an auxiliary base, possibly water, and a catalytically active co-additive, characterized in that carboxylic acid amides are employed as the solvent.
L'invention concerne un procédé amélioré de préparation de 3,5,5-triméthylcyclohex-2-ène-1,4-dione par oxydation de 3,5,5-triméthylcyclohex-3-èn-1-one en présence d'un agent d'oxydation et d'un système de catalyse comprenant un complexe de métaux de transition en tant que catalyseur, une base auxiliaire, éventuellement de l'eau et un co-additif actif du point de vue catalytique. Ce procédé est caractérisé en ce que des amides d'acide carboxylique sont employés en tant que solvant.
Bilz Juergen
Haefner Volker
Huthmacher Klaus
Krill Steffen
Maassen Ralf
Degussa Ag
Marks & Clerk
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