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3. For a discussion, see Clayden, J.; Collington, E. W.; Lamont, R. B.; Warren, S. Tetrahedron Lett., 1993, 34, 2203.
4. Cherest, M.; Felkin, H.; Prudent, N. Tetrahedron Lett., 1968, 2199.
5. Anh, N. T.; Eisenstein, O. Nouv. J. Chim., 1977, 1, 61.