Darstellung und Kristallstrukturen vontBu-substituierten Disiloxanen des TypustBu2SiX-O-SiYtBu2 (X = Y = OH, Br; X = OH, Y = H) und den AdduktentBu3SiOH·(HO3SCF3)0.5·H2O undtBu3SiOLi·(LiO3SCF3)2·(H2O)2

Autor: Hans-Wolfram Lerner, Matthias Wagner, Nils Wiberg, Kurt Polborn, Michael Bolte, Stefan Scholz
Rok vydání: 2005
Předmět:
Zdroj: Zeitschrift für anorganische und allgemeine Chemie. 631:1863-1870
ISSN: 1521-3749
0044-2313
DOI: 10.1002/zaac.200500137
Popis: Syntheses and Crystal Structures of tBu-substituted Disiloxanes tBu2SiX-O-SiYtBu2 (X = Y = OH, Br; X = OH, Y = H) and of the Adducts tBu3SiOH·(HO3SCF3)0.5·H2O and tBu3SiOLi·(LiO3SCF3)2·(H2O)2 The disiloxanes tBu2SiX-O-SiYtBu2 (X = Y = H, OH) are accessible from the reaction of CF3SO2Cl with tBu2SiHOH or tBu2Si(OH)2. By this reaction the disiloxane tBu2SiH-O-SiHtBu2 is formed together with tBu2SiH-O-SiOHtBu2. The disiloxanes tBu2SiX-O-SiYtBu2 (X = Y = Cl, Br) can be synthesized almost quantitatively from tBu2SiH-O-SiHtBu2 with Cl2 and Br2 in CH2Cl2. The structures of the disiloxanes tBu2SiX-O-SiYtBu2 (X = H, Y = OH; X = Y = OH, Br) show almost linear Si-O-Si units with short Si-O bonds. Single crystals of the adducts tBu3SiOH·(HO3SCF3)0.5·H2O and tBu3SiOLi·(LiO3SCF3)2·(H2O)2 have been obtained from the reaction of tBu3SiOH with CF3SO3H and of tBu3SiO3SCF3 with LiOH. According to the result of the X-ray structural analysis (hexagonal, P-62c), tBu3SiOLi · (LiO3SCF3)2·(H2O)2 features the ion pair [(tBu3SiOLi)2(LiO3SCF3)3(H2O)3Li]+ [CF3SO3]−. The central framework of the cation forms a trigonal Li6 prism.
Databáze: OpenAIRE
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