Trifluoro borate anion

Spectral (i.r. and Raman) assignments for the trifluoro(trifluoromethyl)borate anion in K+[CFs BFa] have been made on the basis of Cat> symmetry, using both i B and B compounds Urey-Bradley force constants were computed for the CFa and BFa groupings and compared with those derived from studies on CaFe and BF4-. ... 

An iridium(I) complex with the l,2-bis(tcrt-butylmethylphosphino)ethane (4) and tetrakis(3,5-bis(trifluoromethyl)phenyl)borate as the counter anion catalyzes the hydrogenation of several acyclic aromatic Ai-arylimines under atmospheric hydrogen pressure at room temperature, giving the desired chiral amines with high-to-excellent enantioselectivities (up to 99%, Fig. 6) [19]. The authors also tested (S )-BINAP (Fig. 1) and (/ )-Ph-PHOX (PHOX = 2-[2-(diphenylphosphino) phenyl]-4,5-dihydrooxazole) hgands with lower enantioselectivities [19]. Both steric and electronic properties of the ligand and the combination with the BArF anion are in the base of the efficacy of this catalytic system. On the other hand, attempted hydrogenations of Ai-(2,2,2-trifluoro-l-phenylethylidene)aniline and M-(l,2,2-trimethyl-propylidene)aniline under the same conditions resulted in... 

Fluorinated aryl borates have emerged as versatile organometaiiic WGA reagents in the last decade. Their availability through reliable preparative procedures, or commercial sources, as well as their excellent solubility and stability properties, has made fluorinated aryl borates the anion of choice in many organometaiiic research programs. Two derivatives, in particular, are extremely common tris(pentafluorophenyl)borane derivatives and tetrakis(3,5-trifluoro-methylphenyl)borate (see Figure 18). 

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