METHOD OF PRODUCING PERFLUOROALKYLCYANO- OR PERFLUOROALKYLCYANOFLUOROBORATES Russian patent published in 2016 - IPC C07F5/02 C07F9/54 H01M10/56 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing salts of formula M^a+[B(R_f)(CN)_x(F)_y]_a ^- (I), which can be used as ionic liquids. The method includes reaction of an alkali metal salt of formula Me⁺[B(R_f)F₃]^- (II) with trialkylsilyl cyanide to obtain a salt of formula Me⁺[B(R_f)(CN)_x(F)_y]^- (III) and a salt exchange reaction of a salt of formula III with a salt formula MA (IV). In formula I M^a+ is a silver, copper (I) or copper (II) cation or an organic cation, R_f is a straight or branched perfluorinated alkyl group containing 1-4 C atoms, C₆F₅, C₆H₅, a partially fluorinated phenyl or a phenyl which is mono- or disubstituted with a perfluoroalkyl group containing 1-4 C atoms, where the perfluoroalkyl group is independently selected, a equals 1 or 2, x equals 1, 2 or 3, y equals 0, 1 or 2, where 0 is excluded if R_f=C₆H₅, and x+y=3. In formula II Me⁺ is a lithium, potassium, sodium, caesium or rubidium cation, and R_f has a value given above. In formula III Me⁺, R_f, x and y have values given above. The alkyl group in trialkylsilyl cyanide is in each case, independently, a straight or branched alkyl group containing 1-4 C atoms. In formula IV M has a value given for M^a+, and A is selected from a group of anions F^-, Cl^-, Br^-, I^-, OH^-, [HF₂]^-, [CN]^-, [SCN]^- etc. The invention also relates to a method of producing compounds of formula III, certain lithium salts of formula III, as well as to an electrolyte and an electrochemical cell including said salts.

EFFECT: method enables to obtain salts of formula I with good output from readily available raw materials.

14 cl, 38 ex