METHOD OF PREPARING (FLUOROARYL)BORANE COMPOUND AND METHOD OF PREPARING TETRAKIS(FLUOROARYL)BORATE DERIVATIVE Russian patent published in 2001 - IPC

FIELD: organic synthesis. SUBSTANCE: (fluoroaryl)borane of general formula 3: (3), where R₁-R₅ denote hydrogen or fluorine atoms, alkyl or alkoxy groups, provided that at least one of R₁-R₅ is fluorine atom; X_в denotes fluorine, bromine, chlorine, or iodine atom; and n is equal to 2 or 3, is prepared by interaction of fluoroarylmagnesium compound 1: (1), in which R₁-R₅ are as indicated above and X_a is chlorine, bromine or iodine atom, with boron halide B(X_в)₃ (X_в as above) in solvent (a) containing diethyl ether and/or tetrahydrofuran and solvent (b) with boiling point superior to those of diethyl ether and tetrahydrofuran. Method is distinguished by that reaction is carried out in solvent (a), after which reaction mixture is added to solvent (b) preheated to 80 C or higher and solvent (a) is then distilled off. Tetrakis(fluoroaryl)borate preparation is also described. EFFECT: simplified preparation procedure. 33 cl, 19 ex