Gold(I) complexes with eight-membered NHC ligands: synthesis, structures and catalytic activity
A series of expanded-ring NHC gold complexes of the formula (NaphtDHD−Ar)Au−X (NaphtDHD=4,5-dihydro-1H-naphtho[1,8-ef][1,3]diazocin-3(2H)-ylidene; Ar: Mes=2,4,6-trimethylphenyl, Dipp=2,6-diisopropylphenyl or Xyl=2,6-dimethylphenyl; X=Cl, NCCH3, NTf2) have been synthesized, including the first gold(I...
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| Hauptverfasser: | , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
April 22, 2020
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| In: |
Advanced synthesis & catalysis
Year: 2020, Jahrgang: 362, Heft: 12, Pages: 2523-2533 |
| ISSN: | 1615-4169 |
| DOI: | 10.1002/adsc.202000281 |
| Online-Zugang: | Resolving-System, kostenfrei, Volltext: https://doi.org/10.1002/adsc.202000281 Verlag, kostenfrei, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/adsc.202000281 
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| Verfasserangaben: | Alejandro Cervantes‐Reyes, Frank Rominger, Matthias Rudolph, and A. Stephen K. Hashmi |
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| 520 | |a A series of expanded-ring NHC gold complexes of the formula (NaphtDHD−Ar)Au−X (NaphtDHD=4,5-dihydro-1H-naphtho[1,8-ef][1,3]diazocin-3(2H)-ylidene; Ar: Mes=2,4,6-trimethylphenyl, Dipp=2,6-diisopropylphenyl or Xyl=2,6-dimethylphenyl; X=Cl, NCCH3, NTf2) have been synthesized, including the first gold(I) triflimidate complex (5) stabilized by an eight-membered NHC ligand. The new organogold compounds have been characterized by mass spectrometry, IR spectroscopy, and 1H and 13C NMR spectroscopy. The structural geometries of 3 b-c and 5 have been unequivocally established by crystallographic analysis revealing broad N-C-N angles (>121°) and high buried volume values (46-54%). The first catalytic studies were carried out on the cycloisomerization of 1,6-enynes, obtaining full conversions (0.5 mol% catalyst loading) and excellent endo/exo selectivity (up to 99:1), and on the gold-catalyzed phenol synthesis. Lastly, the (NaphtDHD-Dipp)Au+ NTf2− species was subjected to a kinetic experiment in the cyclization of a N-propargyl carboxamide to evaluate the efficiency of the pre-formed catalyst (5) and the in situ activated gold complex (3 b+AgNTf2). | ||
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