Improved catalysis in halogen exchange reactions

Details Improved catalysis in halogen exchange reactions Improved catalysis in halogen exchange reactions

C - Chemistry, Metallurgy

07

F

C07F 9/06 (2006.01) C07C 17/20 (2006.01) C07F 9/02 (2006.01)

Patent

CA 2311134

Impure tetra(dihydrocarbylamino)phosphonium halide is contacted with a liquid cyclic ether to dissolve the phosphonium halide and leave at least a portion of the impurities comprising at least quaternary ammonium halide or an amidophosphoxide remaining in the solid state. The solids and the liquid phase are separated from each other, an anhydrous non-solvent for the tetra(dihydrocarbylamino)phosphonium halide is mixed with the separated liquid phase to precipitate the tetra(dihydrocarbylamino)phosphonium halide, which is then separated from the liquid phase. The so-treated tetra(dihydrocarbylamino)phosphonium halide is more efficient as a catalyst for halogen exchange reactions than the original untreated tetra(dihydrocarbylamino)phosphonium halide.

Halogénure impur de tétra(dihydrocarbylamino)phosphonium qui est mis en contact avec un éther cyclique liquide pour dissoudre l'halogénuure de phosphonium et laisser à l'état solide au moins une partie des impuretés comprenant au moins de l'halogénure d'ammonium quaternaire ou un amidophosphoxyde. Les solides et la phase liquide sont séparés l'un de l'autre, et un non-solvant anhydre pour l'halogénure de tétra(dihydrocarbylamino)phosphonium est mélangé avec la phase liquide séparée pour précipiter l'halogénure de tétra(dihydrocarbylamino)phosphonium, qui est ensuite séparé de la phase liquide. L'halogénure de tétra(dihydrocarbylamino)phosphonium ainsi traité est plus efficace en tant que catalyseur pour des réactions de substitution par halogène que l'halogénure de tétra(dihydrocarbylamino)phosphonium non traité.

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