Halogen exchange reactions and uses thereof

Details Halogen exchange reactions and uses thereof Halogen exchange reactions and uses thereof

C - Chemistry, Metallurgy

07

C

C07C 17/20 (2006.01) B01J 3/00 (2006.01) B01J 19/18 (2006.01) C07B 39/00 (2006.01) C07C 25/00 (2006.01) C07F 3/02 (2006.01) C07F 5/02 (2006.01)

Patent

CA 2271379

A mixture of (i) finely-divided alkali metal fluoride (e.g., KF), (ii) haloaromatic compound having at least one halogen atom of atomic number greater than 9 on an aromatic ring (e.g., C6Cl6), and (iii) an aminophosphonium catalyst (e.g., Et2N)4PBr), is heated at a temperature at which fluorine replaces one or more of the ring halogen atom of the haloaromatic compound. Processes are described wherein fluorinated perhalobenzenes such as C6ClF5 and C6BrF5 formed in this manner are converted efficiently and at low cost to a variety of industrially important products.

L'invention concerne un mélange composé (i) d'un fluorure de métal alcalin finement séparé (par exemple KF), (ii) d'un composé haloaromatique contenant au moins un atome d'halogène d'un nombre atomique supérieur à 9 dans un noyau aromatique (par exemple C¿6?Cl¿6?), et (iii) d'un catalyseur d'aminophosphonium ( par exemple (Et¿2?N)¿4?PBr); ce mélange est chauffé à une température à laquelle un ou plusieurs des atomes d'halogène du noyau du composé haloaromatique sont substitués par du fluor. L'invention concerne également la description de procédés dans lesquels des perhalobenzènes fluorés tels que C¿6?ClF¿5? et C¿6?BrF¿5? formés de cette manière sont transformés efficacement et à moindre coût en plusieurs produits importants pour l'industrie.

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