Abstract
Permethylcyclopolysilanes are most often prepared by Würtz-type coupling of Me2SiCl2 with Na K alloy in THI: When nonpolar solvents like benzene were used, only linear polysilanes (Me2Si)n were produced, but the addition of a catalytic amount of crown ether 18-crown-6 was found to increase significantly the amount of cyclic oligomers. The ratio of (Me2Si)6 to (Me2Si)5 decreased from 18:1 to 6:1 in the presence of crown ether in a typical synthesis in THF. An explanation based on solvated electron theory has been proposed.
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References
Ch. A. Burkhard,J. Am. Chem. Soc. 71, 963 (1949).
Gilman and R. A. Tomasi,J. Org. Chem. 28, 1651 (1963).
Stolberg,Angew. Chem. Int. Ed. Engl. 2, 150 (1963).
Carberry and R. West,J. Orgamometal. Chem. 6, 582 (1966).
Carberry and R. West,J. Am. Chem. Soc. 91, 5440 (1969).
R. West and W. Wojnowski,IXth Hudson Symp., Plattsburgh, NY (1976), abstracts, p. 32.
R. West, L. Brough, and W. Wojnowski,Inorg. Synth,19, 265 (1979).
Miller and J. Michl,Chem. Rer. 89, 1359 (1989): M. Fujino and H. Isaka,J. Chem. Soc. Chem. Commun, 466 (1989): S. Gauthier and D. J. Worsfold,Macromolecules 22, 2213 (1989): R. G. Jones, R. E. Benfield, R. H. Cragg. A. C. Swain, and S. J. Webb,Macromolecules 26, 4878 (1993).
Proceedings of Colloque Weyl IV, East Lansing 1975.J. Phys. Chem. 79, 2789 (1975): Proceedings of Colloque Weyl V. Aviemore, Scotland 1979,J. Phys. Chem. 84, 1065 (1980): P. P. Edwards.J. Phys. Chem. 88, 3772 (1984).
Carberry, R. West, and G. E. Glass,J. Am. Chem. Soc. 91, 5446 (1969).
L. Brough and R. West,J. Organometal. Chem 194, 139 (1980).
Midgley and A. L. Henne.Ind. Eng. Chem. 75 (1929).
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Pawelec, Z., Wojnowski, W. On the formation of permethylcyclopolysilanes in the würtz-type reaction of Me2SiCl2: The influence of solvent and complexing agent. J Inorg Organomet Polym 5, 163–168 (1995). https://doi.org/10.1007/BF01058144
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DOI: https://doi.org/10.1007/BF01058144