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2. Some recent interesting reviews: (a) Qi, Z.-Q.; Shao, X.-B.; Zhao, X.; Li, X.-Q.; Wang, X.-Z.; Zhang, W.-X.; Jiang, X.-K.; Li, Z.-T. Chin. J. Org. Chem. 2003, 23, 403. (b) Karpfen, A. Adv. Chem. Phys. 2002, 123, 469. (c) Dannenberg, J. J. J. Mol. Struct. 2002, 615, 219. (d) Steiner, T. Angew. Chem. Int. Ed. 2002, 41, 48. (e) Henri-Rousseau, O.; Blaise, P.; Chamma, D. Adv. Chem. Phys. 2002, 121, 241. (f) Sponer, J. V.; Leszczynski, J.; Hobza, P. Theochem 2001, 573, 43.
3. (a) De Visser, S. P.; Shaik, S. J. Am. Chem. Soc. 2003, 125, 7413.
4. (b) Grimaldi, S.; Ostermann, T.; Weiden, N.; Mogi, T.; Miyoshi, H.; Ludwig, B.; Michel, H.; Prisner, T. F.; MacMillan, F. Biochemistry 2003, 42, 5632.
5. (c) Whittaker, J. W. Chem. Rev. 2003, 103, 2347.