Gold(I) complexes stabilized by nine- and ten-membered n-heterocyclic carbene ligands

• Verfasst von: Cervantes Reyes, Alejandro [VerfasserIn]
• Verfasst von: Rominger, Frank [VerfasserIn]
• Verfasst von: Rudolph, Matthias [VerfasserIn]
• Verfasst von: Hashmi, A. Stephen K. [VerfasserIn]
• Titel: Gold(I) complexes stabilized by nine- and ten-membered n-heterocyclic carbene ligands
• Verf.angabe: Alejandro Cervantes‐Reyes, Frank Rominger, Matthias Rudolph, and A. Stephen K. Hashmi
• E-Jahr: 2019
• Jahr: 16 July 2019
• Umfang: 13 S.
• Teil: volume:25
• Teil: year:2019
• Teil: number:50
• Teil: pages:11745-11757
• Teil: extent:13
• Fussnoten: Version of record online: August 8, 2019 ; Gesehen am 07.11.2019
• Titel Quelle: Enthalten in: Chemistry - a European journal
• Ort Quelle: Weinheim : Wiley-VCH, 1995
• Jahr Quelle: 2019
• Band/Heft Quelle: 25(2019), 50, Seite 11745-11757
• ISSN Quelle: 1521-3765
• DOI: doi:10.1002/chem.201902458
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: carbenes
• Sach-SW: catalysis
• Sach-SW: gold
• Sach-SW: ligands
• Sach-SW: N-heterocyclic carbenes
• K10plus-PPN: 1681399393
• K10plus-PPN:
  Universitätsbibliothek
• Lokale URL UB: Zum Volltext

Abstract

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.