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2. (a) A.P. Davis, Methods of Organic Chemistry (Houben-Weyl), vol. E 21 d, in: G. Helmchen, R.W. Hoffmann, J. Mulzer, E. Schaumann (Eds.), Georg Thieme Verlag, Stuttgart, New York, 1995, pp. 3988.
3. (b) M.M. Midland, L.A. Morell, ibid., pp. 4049.
4. Aktuelle Übersichten: (a) H. Brunner, Methods of Organic Chemistry (Houben-Weyl), vol. E 21 d, G. Helmchen, R.W. Hoffmann, J. Mulzer, E. Schaumann (Eds.), Georg Thieme Verlag, Stuttgart, New York, 1995, pp. 3945. (b) R. Noyori, S. Hashiguchi, Acc. Chem. Res. 30 (1997) 97. (c) V. Fehring, R. Selke, Angew. Chem. 110 (1998) 1927; Angew. Chem. Int. Ed. 37 (1998) 1827.
5. (a) M.J. Burk, T.G.P. Harper, C.S. Kalberg, J. Am. Chem. Soc. 117 (1995) 4423.