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Bonding of the iron Lewis acid-THF adduct CpFe(CO)2 · THF to silica gel and its implication for cyclopropanation reactions by D.J. Casper; A.V. Sklyarov; Steve Hardcastle; T.L. Barr; F. Holger Försterling; Kristene F. Surerus; M.M. Hossain is a Chemistry article available to read on EtoBox.
What is Bonding of the iron Lewis acid-THF adduct CpFe(CO)2 · THF to silica gel and its implication for cyclopropanation reactions about?
The adsorption of the iron Lewis acid-THF adduct CpFe(CO) 2 AE THF (1) onto the silica gel has been observed to dramatically alter the cis:trans ratio for cyclopropanation reactions versus the homogeneous catalyzed reactions. To better understand this dramatic change in selectivity, we investigated the nature of bonding of 1 on silica with a number of analytical techniques. X-ray photoelectron spectroscopy showed the presence of a new peak at 687.7 eV for the silica-supported catalyst, which indicated possible fluorination by the BF 4 À anion. Further experiments using solid state NMR showed that a new boron species was also generated by the adsorption onto the silica gel. Mo ̈ssbauer spectroscopy showed that adsorption of the iron Lewis acid-THF adduct onto the silica gel did not change the oxidation state to the iron; however, diffuse reflectance infrared spectroscopy showed the loss of surface hydroxyl groups and a shift in one of the C-O absorptions to higher wave numbers. The combined data suggest fluorination of the silica surface by the BF 4 À anion. This theory was tested by adsorption of the iron Lewis acid-THF adduct onto a polytrimethyl hydrosilylsilicate resin and sodi
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- Author
- D.J. Casper; A.V. Sklyarov; Steve Hardcastle; T.L. Barr; F. Holger Försterling; Kristene F. Surerus; M.M. Hossain
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0020-1693)
- Published
- 2006
- Language
- EN
- Field
- Chemistry (Physical Sciences)