1. For recent reviews on ionic liquids in organic chemistry, see: (a) Carlin, R. T.; Wilkes, J. S. In Advances in Nonaqueous Chemistry; Mamantov, G.; Popov, A., Eds.; VCH: New York, 1994;
2. (b) Chauvin, Y.; Olivier, H. ChemTech 1995, 25, 26;
3. (c) Seddon, K. R. J. Chem. Tech. Biotechnol. 1997, 68, 351;
4. (d) Olivier, H. J. Mol. Cat. A: Chem. 1999, 146, 285;
5. (e) Welton, T. Chem. Rev. 1999, 99, 2071;