Journal
DALTON TRANSACTIONS
Volume 40, Issue 12, Pages 2995-2999Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0dt00932f
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Gold(I) N-heterocyclic carbene complexes (Au-NHC) with symmetric (bis-benzyl, -propyl and -mesityl substituents) and dissymmetric (mesityl and alkyl - benzyl or propyl - substituents) NHC ligands were synthesized and tested as catalysts for the addition of methanol to 3-hexyne, as a representative internal alkyne. While symmetric ones - bis-alkyl (propyl or benzyl) or bis-mesityl systems - displayed low activity, dissymmetric Au-NHC systems with one alkyl (benzyl or propyl) and one mesityl groups on the NHC unit were unexpectedly highly active with rates and turnover numbers up to 294 000 h(-1) and 800 000 mol. mol(Au) (-1).
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