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3. For recent examples of complexes containing two-atom-bridged phosphino-cyclopentadienyl ligands see: (a) M.D. Fryzuk, S.S.H. Mao, P.D. Duval, S.J. Rettig, Polyhedron 14 (1995) 11. (b) N.E. Schore, J. Am. Chem. Soc. 101 (1979) 7410. (c) J. Foerstner, A Kakoschke, D. Stellfeldt, H. Butenschön, R. Wartchow, Organometallics 17 (1998) 893. (d) J.C. Leblanc, C. Moise, A. Maisonnat, R. Poilblanc, C. Charrier, F. Mathey, J. Organomet. Chem. 231 (1982) C43. (e) I. Lee, F. Dahan, A. Maisonnat, R. Poilblanc, J. Organomet. Chem. 532 (1997) 159. (f) T. Cuenca, J.C. Flores, P. Royo, J. Organomet. Chem. 462 (1993) 191.
4. For examples of one-atom-bridged phosphino-cyclopentadienyl ligands see: (a) D.M. Bensley, E.A. Mintz, J. Organomet. Chem. 353 (1988) 93. (b) G. Marr, T.M. White, J. Chem. Soc. Perkin Trans. 1 (1973) 1955. (c) J.A. Miguel-Garcia, H. Adams, N.A. Bailey, P.M. Maitlis, J. Organomet. Chem. 413 (1991) 427. (d) M. Sawamura, H. Hamashima, M. Sugawara, R. Kuwano, Y. Ito, Organometallics 14 (1995) 4549. (e) M. Sawamura, H. Hamashima, Y. Ito, Tetrahedron Asym. 2 (1991) 593. (f) N.C. Zanetti, F. Spindler, J. Spencer, A. Togni, G. Rihs, Organometallics 15 (1996) 860. (g) Y. Yamamoto, T. Tanase, I. Mori, Y. Nakamura, J. Chem. Soc. Dalton Trans. (1994) 3191. (h) S. Hoppe, H. Weichmann, K. Jurkschat, C. Schneider-Koglin, M. Dräger, J. Organomet. Chem. 505 (1995) 63. (i) N.J. Goodwin, W. Henderson, B.K. Nicholson, J. Chem. Soc. Chem. Commun. (1997) 31.
5. For examples of complexes containing three-atom-bridged phosphino-cyclopentadienyl ligands see: (a) D.M. Bensley, E.A. Mintz, S. Sussangkarn, J. Org. Chem. 53 (1988) 4417. (b) M.J. Atherton, J. Fawcett, J.H. Holloway, E.G. Hope, A. Karaçar, D.R. Russell, G.C. Saunders, J. Chem. Soc. Chem. Commun. (1995) 191. (c) L.P. Barthel-Rosa, V.J. Catalano, K. Maitra, J.H. Nelson, Organometallics 15 (1996) 3924.