Method of producing tetrakis (pentafluorophenyl) borate derivatives using pentafluorophenyl alkali metal salt prepared from pentafluorobenzene

摘要

The invention relates to a method for producing tetrakis(pentafluorophenyl)borate derivatives of the formula (C.sub.6 F. sub.5).sub.4 BM which comprises reacting 1 equivalent of pentafluorobenzene with 0.5 to 1.5 equivalents of an organometallic compound RM at -120° to 80° C., in an ether type solvent, a hydrocarbon type solvent or a mixture thereof, to generate pentafluorophenyl alkali metal salt represented by the formula C.sub.6 F. sub.5 M, and then reacting either (1) not less than 3.7 equivalents of said pentafluorophenyl alkali metal salt with 1 equivalent of a boron compound BX.sub.3, or (2) not less than 0.8 equivalents of said pentafluorophenyl alkali metal salt with 1 equivalent of tris(pentafluorophenyl)borane.