Trifluoromethylation of carbon and boron with CF3SiMe3/NMe4F: formation of NMe4[trans-CF3CFCFB(CF3)3]

Trimethylamine-trifluoroethenyl-bis(trifluoromethyl)borane [F2CCF(CF3)2B·NMe3] (1) reacts with NMe4[(CF3)2SiMe3] in THF solution to form trimethylamine-bis(trifluoromethyl)pentafluoropropenylborane [trans-CF3CFCF(CF3)2B·NMe3] (3), the fluoroborate NMe4[trans-CF3CFCF(CF3)2BF] (4), the novel borates NMe4[trans-CF3CFCFB(CF3)3] (5) and NMe4[cyclo-(CF3)2BCF2CFCF2CF3] (6).