Lewis acid catalyst. Prepn and characterization: A. G. Massey, A. J. Park, J. Organomet. Chem. 2, 245 (1964); and NMR study of adducts: eidem, ibid. 5, 218 (1966). Catalytic role in olefin polymerization: X. Yang et al., J. Am. Chem. Soc. 116, 10015 (1994). Lewis acid properties: H. Jacobsen et al., Organometallics 18, 1724 (1999). Prepn and properties of B(C6F5)3 radical anion: R. J. Kwaan et al., ibid. 20, 3818 (2001). Review of chemistry and uses: W. E. Piers, T. Chivers, Chem. Soc. Rev. 26, 345-354 (1997).