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2. Chelucci, G. Tetrahedron: Asymmetry 1997, 8, 2667.
3. Nordström, K.; Macedo, E.; Moberg, C. J. Org. Chem. 1997, 62, 1604.
4. Chelucci, G.; Medici, S.; Saba, A. Tetrahedron: Asymmetry 1997, 8, 3183.
5. Fife, W. K. J. Org. Chem. 1983, 48, 1375.