1. (a) A. Eisenstadt, M. Cais, Isr. J. Chem. 5 (1967) 37p. (b) T.D. Turbitt, W.E. Watts, J. Organomet. Chem. 46 (1972) 109. (c) P. Dodey, B. Gautheron, C.R. Hebd. Seance Acad. Sci. Ser. C (1975) 1113. (d) W. Crawford, T.D. Turbitt, W.E. Watts, J. Organomet. Chem. 105 (1976) 341.
2. (a) M. Sališová, Š. Toma, E. Sołčániová, J. Organomet. Chem. 132 (1977) 419. (b) E. Gyepes, T. Glowiak, Š. Toma, J. Soldánová, J. Organomet. Chem. 276 (1984) 209. (c) E. Gyepes, T. Glowiak, Š. Toma, J. Organomet. Chem. 316 (1986) 163.
3. For two formally related aldol examples see: (a) M. Sališova, Š. Toma, E. Sołčániová, Coll. Czech. Chem. Commun. 45 (1980) 1290. (b) Y. Omote, R. Kobayashi, Y. Nakada, N. Sugiyama, Bull. Chem. Soc. Jpn. 46 (1973) 3315. For indications of a reversible intramolecular aldol coupling of 10 see: (c) C.R. Hauser, C.E. Cain, J. Org. Chem. 23 (1958) 1142. (d) C.E. Cain, T.A. Mashburn, C.R. Hauser, J. Org. Chem. 26 (1961) 1030. (e) C.R. Hauser, T.A. Mashburn, J. Org. Chem. 26 (1961) 1795.
4. (a) I.M. Paushkin, L.S. Polak, T.P. Vishnyakova, I.I. Patalakh, F.F. Macchus, T.A. Sokolinskaya, J. Polym. Sci. C 4 (1963) 1481. (b) H. Kono, M. Shiga, I. Motoyama, K. Hata, Bull. Chem. Soc. Jpn. 42 (1969) 3267. (c) A. Kasahara, T. Izumi, I. Shimizu, Chem. Lett. (1979) 1317. (d) S. Kamiyama, A. Kasahara, T. Izumi, I. Shimizu, H. Watabe, Bull. Chem. Soc. Jpn. 54 (1981) 2079. (e) J. Mirek, S. Rachwał, T. Górecki, B. Kawałek, P. Milart, E. Szneler, J. Organomet. Chem. 344 (1988) 363. (f) J.J.C. Erasmus, G.J. Lamprecht, J.C. Swarts, A. Roodt, A. Oskarsson, Acta Crystallogr. C 52 (1996) 3000.
5. In contrast, Michael additions are frequently used to prepare [5]ferrocenophanes or larger ring systems. For examples see: (a) T.A. Mashburn, C.E. Cain, C.R. Hauser, J. Org. Chem. 25 (1960) 1982. (b) M. Furdik, Š. Toma, J. Suchy, P. Elecko, Chem. Zvesti, 15 (1961) 45. (c) Š. Toma, A. Gaplovsky, Coll. Czech. Chem. Commun. 47 (1983) 1988. (d) R. Dabard, H. Patin, Bull. Soc. Chim. Fr. (1973) 2158. (e) I.H. Barr, W.E. Watts, Tetrahedron 24 (1968) 3219.