Synthesis and structural investigation of R2Si (R = Me, Ph) bridged di-N-heterocyclic carbenes
2014 | journal article. A publication with affiliation to the University of Göttingen.
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Synthesis and structural investigation of R2Si (R = Me, Ph) bridged di-N-heterocyclic carbenes
Ghadwal, R. S.; Reichmann, S. O.; Carl, E. & Herbst-Irmer, R. (2014)
Dalton Transactions, 43(36) pp. 13704-13710. DOI: https://doi.org/10.1039/c4dt01681e
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Details
- Authors
- Ghadwal, Rajendra S.; Reichmann, Sven O.; Carl, Elena; Herbst-Irmer, Regine
- Abstract
- Functionalization of the C4 carbon of an imidazol-derived N-heterocyclic carbene (NHC) may allow fine-tuning of the electronic and steric properties of the C2 carbene center. A facile route to silyl-functionalized di-N-heterocyclic carbenes (Di-NHCs) is described. Treatment of the polymeric lithiated NHC, {Li(IPrH)}(n) (1) (Li(IPrH) = {(N-2,6-/Pr2C6H3)(2)CHCLi}C:) with a dichlorosilane affords monomeric silyl-functionalized Di-NHCs, R2Si(IPrH)(2) (R = Ph, 2; Me, 3). Interestingly, silyl-functionalized mono-NHC, Ph-2(Cl)Si(IPrH) (4) with a pendant chloro-substituent can also be exclusively isolated maintaining the reactants 1 and Ph2SiCl2 ratio. NHCs 2 and 4 readily form copper complexes, Ph2Si{(IPrH)CuCl}(2) (5) and Ph-2(Cl)Si{(IPrH)CuCl} (6), on reaction with CuCl. Straightforward conversion of an NHC to a Di-NHC (2 or 3) via C4 functionalization is reported for the first time. Molecular structures of 2, 4, 5 and 6 have been established by single crystal X-ray diffraction studies.
- Issue Date
- 2014
- Status
- published
- Publisher
- Royal Soc Chemistry
- Journal
- Dalton Transactions
- ISSN
- 1477-9234; 1477-9226