Gold(I) complexes stabilized by nine- and ten-membered n-heterocyclic carbene ligands
Nine- and ten-membered N-heterocyclic carbene (NHC) ligands have been developed and for the first time their gold(I) complexes were synthesized. The protonated NHC pro-ligands 2 a-h were prepared by the reaction of readily available N,N′-diarylformamidines with bis-electrophilic building blocks, fol...
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| Main Authors: | , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
16 July 2019
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| In: |
Chemistry - a European journal
Year: 2019, Volume: 25, Issue: 50, Pages: 11745-11757 |
| ISSN: | 1521-3765 |
| DOI: | 10.1002/chem.201902458 |
| Online Access: | Resolving-System, Volltext: https://doi.org/10.1002/chem.201902458 Verlag: https://onlinelibrary.wiley.com/doi/abs/10.1002/chem.201902458 
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| Author Notes: | Alejandro Cervantes‐Reyes, Frank Rominger, Matthias Rudolph, and A. Stephen K. Hashmi |
| Summary: | Nine- and ten-membered N-heterocyclic carbene (NHC) ligands have been developed and for the first time their gold(I) complexes were synthesized. The protonated NHC pro-ligands 2 a-h were prepared by the reaction of readily available N,N′-diarylformamidines with bis-electrophilic building blocks, followed by anion exchange. In situ deprotonation of the tetrafluoroborates 2 a-h with tBuOK in the presence of AuCl(SMe2) provided fast access to NHC-gold(I) complexes 3-10. These new NHC-gold(I) complexes show very good catalytic activity in a cycloisomerization reaction (0.1 mol % catalyst loading, up to 100 % conversion) and their solid-state structures reveal high steric hindrance around the metal atom (%Vbur up to 53.0) which is caused by their expanded-ring architecture. |
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| Item Description: | Version of record online: August 8, 2019 Gesehen am 07.11.2019 |
| Physical Description: | Online Resource |
| ISSN: | 1521-3765 |
| DOI: | 10.1002/chem.201902458 |