1. J. N. Nichols (1984)Polyhedrom 3 1307; (b) M. D. Vaira, P. Stoppioni, and M. Peruzzini (1987).Polyhedron 6, 351; (c) D. Fenske, J. Ohmer, J. Hachgenei. and K. Merzweiler (1988).Angew. Chem. Int. Ed. Engl. 27, 1277; (d) O. J. Scherer (1985).Angew. Chem. Int. Ed. Engl. 24, 924; (e) O. J. Scherer (1990).Angew. Chem. Int. Ed. Engl. 29, 1104; (f) G. Schmid (1978).Angew. Chem. Int. Ed. Engl. 17, 392; (g) W. A. Hermann (1986)_.Angew. Chem. Int. Ed. Engl. 25, 56; (h) N. A. Compton, R. J. Errington, and N. C. Norman (1990).Adv. Organomet. Chem. 31, 91; (i) T. P. Fehlner (1988).Comments. Inorg. Chem. 7, 307; (j) K. H. Whitmire (1988).J. Coord. Chem. B. 17, 95; (k) N. K. Norman (1988)Comments. Inorg.Chem. 7, 307; (j) K. H. Whitmire (1988),J. Coord. Chem. B. 17, 95; (k) N. K. Norman (1988).Chem. Soc. Rev. 17, 269; (l) P. Mathur, D. Chakrabarty, and I.J. Mavunkal (1994).J. Cluster. Sci. 4, 3 51; (m) K. H. Whitmirein H. W. Roesky (ed.),Rings Clusters and Polymers of Main Group and Transition Elements (Elsevier, 1989), p. 503.
2. L. Mond, H. Hirtz, and M. D. Cowap (1910).Chem. Soc. 92, 798.
3. P. Chini and B. T. Heaton (1977).Top. Curr. Chem. 71, 1.
4. E. Sappa, A. Tiripicchio, A. J. Carty, and G. E. Toogood (1987).Prog. Inorg. Chem. 35, 437.
5. M. Manassero, M. Sansoni, and G. Longoni (1976). J. Chem. Soc. Chem. Commun. 919.