[{Au(IPr)}2(μ-OH)]X Complexes: Synthetic, Structural and Catalytic Studies

Ruben S. Ramon, Sylvain Gaillard, Albert Poater, Luigi Cavallo, Alexandra M. Z. Slawin, Steven P. Nolan

Research output: Contribution to journalArticlepeer-review

107 Citations (Scopus)

Abstract

The synthesis of a series of dinuclear gold hydroxide complexes has been achieved. These complexes of type [{Au(IPr)}2(mu-OH)]X (X =BF4, NTf2, OTf, FABA, SbF6; IPr =2,6-bis(disopropylphenyl)imidazol-2-ylidene; NTf2= bis(trifluoromethanesulfonyl)imidate; OTf = trifluoromethanesulfonate; FABA = tetrakis(pentafluorophenyl)borate) are easily formed in the presence of water and prove highly efficient in the catalytic hydration of nitrites. Their facile formation in aqueous media suggests they are of relevance in gold-catalyzed reactions involving water. Additionally, a series of [Au-(IPr)(NCR)][BR4] (R = alkyl, aryl) ficient in the catalytic hydration of nitrites. Their facile formation in aqueous media suggests they are of relevance in gold-catalyzed reactions involving water. Additionally, a series of [Au-(IPr)(NCR)][BR4] (R= alkyl, aryl) complexes was synthesized as they possibly occur as intermediates in the catalytic reaction mechanism. H-1 and C-13 NMR data as well as key bond lengths obtained by X-ray diffraction studies are compared and reveal an interesting structure activity relationship. The collected data indicate a negligible effect of the nature of the nitrite on the reactivity of [Au(L)(NCR)][X] complexes in catalysis.

Original languageEnglish
Pages (from-to)1238-1246
Number of pages9
JournalChemistry - A European Journal
Volume17
Issue number4
Early online date16 Dec 2010
DOIs
Publication statusPublished - 24 Jan 2011

Keywords

  • gold
  • homogeneous catalysis
  • hydration
  • N-heterocyclic carbenes
  • nitrites
  • N-HETEROCYCLIC CARBENES
  • GOLD CATALYSIS
  • CATIONIC GOLD(I)
  • BOND ORDER
  • CYCLIZATIONS
  • 1,6-ENYNES
  • NITRILES
  • VALENCE
  • CYCLOISOMERIZATION
  • REARRANGEMENTS

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