反应详情

Moreover, that patent also discloses a method in which aluminum sulfate 18 hydrate is used instead of water. Specifically, aluminum sulfate 18 hydrate containing water of 1.77 molar equivalent vs. tris(pentafluorophenyl)borane is added to a toluene solution of tris(pentafluorophenyl)borane. After the solution is refluxed, insoluble aluminum sulfate is separated from the reaction mixture. A solvent of the filtrate is removed in vacuo. Toluene is added to the thus obtained residues. After stirring, the insoluble material is filtered through a G4 sintered-glass so as to be separated. The solvent of the filtrate is again removed in vacuo. Heptane is added to the residues. The solution is stirred and filtered so that a cake is obtained. Finally, the thus obtained cake is washed with heptane, and dried in vacuo so as to isolate bis(pentafluorophenyl)borinic acid. However, this method has such a problem that it is necessary to remove the byproduct aluminum sulfate and its process is so complicated.

1. temperatureAfter the solution is refluxed
2. custominsoluble aluminum sulfate is separated from the reaction mixture
3. customA solvent of the filtrate is removed in vacuo
4. additionToluene is added to the thus obtained residues
5. filtrationthe insoluble material is filtered through a G4 sintered-glass so as
6. customto be separated
7. customThe solvent of the filtrate is again removed in vacuo
8. additionHeptane is added to the residues
9. stirringThe solution is stirred
10. filtrationfiltered so that a cake
11. customis obtained
12. washFinally, the thus obtained cake is washed with heptane
13. customdried in vacuo so as