Patent ID: 6700019
Filing Date: 2004-03-02
Classification: C07F

Abstract:
A process for the preparation of tetrakis(pentafluorophenyl) borate of formula:MB(C6F5)4 wherein M is Na+, Li+ or K+, said process comprising the steps of:(a) bringing into contact, in a reaction mixture, a solution of a compound of formula:C6F5X, wherein X is H, Cl, Br or I, in anhydrous butyl ether with an alkyllithium, said alkyl group comprising from 1 to 10 carbon atoms, in a molar ratio pentafluorobenzene/alkyllithium of between 1 and 1.1, in order to obtain a product; (b) bringing into contact the resulting product obtained in step a) with BR3 in a gaseous form, undissolved beforehand before its introduction into the reaction mixture, wherein the R groups, identical or different, are a chlorine atom, a fluorine atom, a bromine atom or an alkoxy radical comprising between 1 and 4 carbon atoms; and (c) recovering the tetrakis(pentafluorophenyl) borate from the reaction mixture.