Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 22, Issue 15, Pages 5376-5383Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201504777
Keywords
cations; chirality; Lewis acids; metallocenes; silicon
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Funding
- Deutsche Forschungsgemeinschaft [Sonderforschungsbereich 858]
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The preparation of a series of planar chiral, ferrocenyl-substituted hydrosilanes as precursors of ferrocene-stabilized silicon cations is described. These molecules also feature stereogenicity at the silicon atom. The generation and (SiNMR)-Si-29 spectroscopic characterization of the corresponding silicon cations is reported, and problems arising from interactions of the electron-deficient silicon atom and adjacent C(sp(3))-H bonds or aromatic donors are discussed. These issues are overcome by tethering another substituent at the silicon atom to the ferrocene backbone. The resulting annulation also imparts conformational rigidity and steric hindrance in such a way that the central chirality at the silicon atom is set with complete diastereocontrol. These chiral Lewis acid catalysts were then tested in difficult Diels-Alder reactions, but no enantioinduction was seen.
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