Abstract
Three silyl-substituted fluorenes have been prepared by direct synthetic methods and structurally characterized by X-ray diffraction. The three silyl-substituted fluorenes studied were 9-trimethylsilylfluorene (1), 9-(tert-butyldimethyl)silylfluorene (2), and 2,7-di-tert-butyl-9-trimethylsilylfluorene (3). Complex 1 is orthorhombic, P212121, a = 6.2681(14) Å, b = 14.329(3) Å, c = 15.231(4) Å, Z = 4. Complex 2 is monoclinic, P21/c, a = 12.1953(10) Å, b = 6.9977(6) Å, c = 19.6536(17) Å, β = 93.818(2)○, Z = 4. Complex 3 is monoclinic, P21/c, a = 11.9954(9) Å, b = 9.8978(7) Å, c = 18.5464(13) Å, β = 92.456(2)○, Z = 4. The long carbon–silicon bonds effectively remove any significant intramolecular interactions as little distortion is exhibited around the sp 3-carbon atom and the fluorenyl backbone demonstrates near planarity. The bulky silicon substituents also prevent intermolecular interactions, as only a few close contacts less than 4.0 Å exist in all three solid state structures.
Similar content being viewed by others
References
O'Connor, J.M.; Casey, C.P. Chem. Rev. 1987, 87, 307.
Biagioni, R.N.; Lorkovic, I.M.; Skelton, J.; Hartung, J.B. Organometallics 1990, 9, 547.
Halterman, R.L. In Metallocenes; Togni, A.; Halterman, R.L., Eds.; Wiley-VCH: Weinheim, 1998; Vol. 1, p 520.
Samuel, E.; Setton, R. J. Organomet. Chem. 1965, 4, 156.
Samuel, E.; Alt, H.G.; Hrncir, D.C.; Rausch, M.D. J. Organomet. Chem. 1976, 113, 331.
Harder, S.; Feil, F.; Knoll, K. Angew. Chem., Int. Ed. 2001, 40, 4261.
Schmid, M.A.; Alt, H.G.; Milius, W. J. Organomet. Chem. 1996, 525, 15.
Nakamura, H.; Nakayama, Y.; Yasuda, H.; Maruo, T.; Kanehisa, N.; Kai, Y. Organometallics 2000, 19, 5392.
Constantine, S.P.; Hitchcock, P.B.; Lawless, G.A. Organometallics 1996, 15, 3905.
Constantine, S.P.; Cox, H.; Hitchcock, P.B.; Lawless, G.A. Organometallics 2000, 19, 317.
Carpino, L.A.; Wu, A.-C. U.S. Patent 5,101,059 1991.
Stigers, K.D.; Koutroulis, M.R.; Chung, D.M.; Nowick, J.S. J. Org. Chem. 2000, 65, 3858.
Carpino, L.A.; Wu, A.-C. J. Org. Chem. 2000, 65, 9238.
Silaghi-Dumitrescu, L.; Haiduc, I.; Escudie, J.; Couret, C.; Satge, J. Synth. React. Inorg. Met.-Org. Chem. 1995, 25, 575.
Sheldrick, G.M.; Dauter, Z.; Wilson, K.S.; Hope, H.; Sieker, L.C. Acta Crystallogr. D 1993, 49, 18.
Sheldrick, G. M. SHELXL97, Program for the Refinement of Crystal Structures; University of Gottingen: Germany, 1997.
Karczmarzyk, Z.; Mojzych, M.; Rykowski, A. J. Chem. Crystallogr. 2000, 30, 423.
Knjazhanski, S.Y.; Moreno, G.; Cadenas, G.; Belsky, V.K.; Bulychev, B.M. Tetrahedron 1999, 55, 1639.
Zaitseva, G.S.; Karlov, S.S.; Siggelkow, B.A.; Avtomonov, E.V.; Churakov, A.V.; Howard, J.A.K.; Lorberth, J. Z. Naturforsch, B: Chem. Sci. 1998, 53, 1247.
Rengstl, A.; Schuber, U. Chem. Ber. 1980, 113, 278.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Overby, J.S., Woofter, R.T., Rheingold, A.L. et al. The synthesis and structural characterization of silyl-substituted fluorenes. Journal of Chemical Crystallography 33, 357–364 (2003). https://doi.org/10.1023/A:1024221928841
Issue Date:
DOI: https://doi.org/10.1023/A:1024221928841