Isolated silver intermediate of gold precatalyst activation
The silver chloride and gold chloride complex of the extremely sterically shielding N-heterocyclic carbene ligand IPr** have been synthesized and characterized. Formally, eight methyl groups of IPr have been replaced by 4-tert-butylphenyl substituents, and two para-methyl groups have been added. The...
Gespeichert in:
| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
25 April 2012
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| In: |
European journal of inorganic chemistry
Year: 2012, Heft: 17, Pages: 2863-2867 |
| ISSN: | 1099-0682 |
| DOI: | 10.1002/ejic.201200327 |
| Online-Zugang: | Verlag, Volltext: https://doi.org/10.1002/ejic.201200327 Verlag, Volltext: https://www.onlinelibrary.wiley.com/doi/abs/10.1002/ejic.201200327 
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| Verfasserangaben: | Simone G. Weber, Frank Rominger, Bernd F. Straub |
MARC
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| 520 | |a The silver chloride and gold chloride complex of the extremely sterically shielding N-heterocyclic carbene ligand IPr** have been synthesized and characterized. Formally, eight methyl groups of IPr have been replaced by 4-tert-butylphenyl substituents, and two para-methyl groups have been added. The world record for the ligand's buried volume (55.4 % for IPr**AuCl, and 56.7 % for IPr**AgCl) has been determined by single-crystal X-ray analyses. Reaction of IPr**AuCl with AgSbF6 in toluene yields AgCl and a cationic gold complex with toluene coordination. The same reaction in 1,2-dichloroethane leads to precipitation of AgCl and an equilibrium of [IPr**Au]SbF6 and [IPr**AuClAg]SbF6. Single crystals of the latter were suitable for an X-ray structure analysis, which reveal an Au-Cl-Ag triangle with an almost undisturbed IPr**-Au-Cl fragment and the coordination of two IPr** arenes to a silver cation. The structural parameters emphasize the role of NHC-Au cations as highly electrophilic “soft protons”. | ||
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| 650 | 4 | |a Silver | |
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