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Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
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Pentiptycene-based concave NHC-metal complexes.

Roman Savka1, Sabine Foro1, Herbert Plenio1

  • 1Organometallic Chemistry, Alarich-Weiss-Str. 12, TU Darmstadt, 64287 Darmstadt, Germany. plenio@tu-darmstadt.de.

Dalton Transactions (Cambridge, England : 2003)
|June 18, 2016
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Summary
This summary is machine-generated.

Researchers synthesized novel bispentiptycene-imidazolium salts, precursors to N-heterocyclic carbenes (NHCs). These NHC precursors were successfully converted into various metal complexes, including copper, silver, and gold compounds.

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Area of Science:

  • Organic Synthesis
  • Organometallic Chemistry
  • Supramolecular Chemistry

Background:

  • Pentiptycene scaffolds offer unique three-dimensional structures.
  • N-heterocyclic carbenes (NHCs) are versatile ligands in organometallic chemistry.
  • Developing novel NHC ligands with specific steric and electronic properties is crucial for catalysis and materials science.

Purpose of the Study:

  • To synthesize novel bispentiptycene-imidazolium salts.
  • To explore the coordination chemistry of these NHC precursors with various metal ions.
  • To investigate the structural properties of the resulting metal complexes.

Main Methods:

  • Reaction of 1-amino,4-hydroxy-pentiptycene with diketones to form diimines.
  • Alkylation and cyclization to yield bispentiptycene-imidazolium salts (NHC·HCl).
  • Complexation of NHC precursors with metal halides (CuI, AgCl, AuCl) and iridium precursors.

Main Results:

  • Successful synthesis of bispentiptycene-imidazolium salts in good yields.
  • Formation of metal complexes including [(NHC)CuI], [(NHC)AgCl], [(NHC)AuCl], [(NHC)IrCl(cod)], and [(NHC)IrCl(CO)2].
  • Solid-state structure of [(NHC)AgCl] revealed a bowl-shaped ligand conformation with the silver center encapsulated.

Conclusions:

  • Novel NHC precursors based on the pentiptycene framework were synthesized.
  • These precursors readily form stable metal complexes with diverse transition metals.
  • The unique structural features of the pentiptycene ligand influence the coordination geometry and properties of the metal complexes.