Schmidbaur, H.; Weidlein, J.; Mitschke, K. H., Chemische Berichte, 1969, vol. 102, p. 4136 - 4146
作者:Schmidbaur, H.、Weidlein, J.、Mitschke, K. H.
DOI:——
日期:——
Reactions of incompletely-condensed silsesquioxanes with pentamethylantimony: a new synthesis of metallasilsesquioxanes with important implications for the chemistry of silica surfaces
作者:Frank J. Feher、Theodore A. Budzichowski、Kamyar Rahimian、Joseph W. Ziller
DOI:10.1021/ja00036a038
日期:1992.5
The reactions of the incompletely condensed polyhedral oligosilsesquioxanes (c-C6H11)7Si7O9(OH)3 (1a), (c-C6H11)7Si7O9(OTMS)(OH)2, (2a), (c-C6H11)7Si7O9(OTMS)2(OH) (3a), (c-C6H11)8Si8O10(OH)2 (4a), and (c-C6H11)7Si7O10(OH) (5a) with excess Me5Sb result in the formation of the corresponding stibonium-substituted silsesquioxanes (c-C6H11)7Si7O9(OSbMe4)3 (1b), (c-C6H11)7Si7O9(OTMS)(OSbMe4)2 (2b), (c-C6H11)7Si7O9(OTMS)2(OSbMe4) (3b), (c-C6H11)8Si8O10(OSbMe4)2 (4b), and (c-C6H11)7Si7O10(OSbMe4) (5b) in high yields. These stibonium siloxides show enhanced reactivity toward main-group and transition-metal halide complexes and provide an alternative route for the preparation of metallasilsesquioxanes. The reaction of 1a with 1 equiv of Me5Sb is much faster than the reactions of Me5Sb with silanols containing fewer than three mutually hydrogen-bonded siloxy groups. This suggests that multiply hydrogen-bonded surface sites are more reactive toward nucleophilic organometallic reagents than either isolated surface silanols or isolated pairs of geminally or vicinally hydrogen-bonded siloxy groups.
Schmidbaur, Hubert; Milewski-Mahrla, Beatrix; Wagner, Fritz E., Zeitschrift fur Naturforschung, Teil B: Anorganische Chemie, Organische Chemie, 1983, vol. 38, # 11, p. 1477 - 1483
作者:Schmidbaur, Hubert、Milewski-Mahrla, Beatrix、Wagner, Fritz E.
DOI:——
日期:——
SCHMIDBAUR, H.;MILEWSKI-MAHRLA, B.;WAGNER, F. E., Z. NATURFORSCH., 1983, 38, N 11, 1477-1483
作者:SCHMIDBAUR, H.、MILEWSKI-MAHRLA, B.、WAGNER, F. E.