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Isomerism in Complexes
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Facile routes to abnormal-NHC-cobalt(ii) complexes.

Rajendra S Ghadwal1, Jan-Hendrik Lamm, Dennis Rottschäfer

  • 1Anorganische Molekülchemie und Katalyse, Am Lehrstuhl für Anorganische Chemie und Strukturchemie, Fakultät für Chemie, Universität Bielefeld, Universitätsstr. 25, D-33615, Bielefeld, Germany. rghadwal@uni-bielefeld.de.

Dalton Transactions (Cambridge, England : 2003)
|June 3, 2017
PubMed
Summary

Researchers synthesized a novel cobalt complex featuring an abnormal N-heterocyclic carbene (aNHC). This aNHC-cobalt complex can be used to create other aNHC-metal compounds, expanding synthetic possibilities.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Carbene Chemistry

Background:

  • N-heterocyclic carbenes (NHCs) are versatile ligands in organometallic chemistry.
  • Abnormal N-heterocyclic carbenes (aNHCs) offer unique electronic and steric properties compared to conventional NHCs.
  • Cobalt complexes are of interest due to their catalytic potential.

Purpose of the Study:

  • To synthesize and characterize a novel cobalt complex bearing an abnormal N-heterocyclic carbene ligand.
  • To explore the reactivity of the aNHC-cobalt complex as a potential aNHC-transfer agent.
  • To investigate the formation of new aNHC-metal complexes.

Main Methods:

  • Deprotonation of the [IPrPh]I precursor using cobalt bis(bis(trimethylsilyl)amide) [Co{N(SiMe3)2}2].
  • Reaction of the precursor with sodium triethylborohydride (NaHBEt3) to form an aNHC-borane adduct.
  • Utilizing the aNHC-borane adduct as an aNHC-transfer agent in reactions with cobalt bis(bis(trimethylsilyl)amide).

Main Results:

  • Successful synthesis of the abnormal N-heterocyclic carbene cobalt diiodide complex, (aIPrPh)2CoI2.
  • Formation of the aNHC-borane adduct, (aIPrPh)BEt3, which functions as an effective aNHC-transfer agent.
  • Synthesis of a new aNHC-cobalt complex, (aIPrPh)Co{N(SiMe3)2}2, via aNHC transfer.

Conclusions:

  • A novel synthetic route to abnormal N-heterocyclic carbene cobalt complexes has been established.
  • The aNHC-borane adduct serves as a convenient precursor for transferring the aNHC ligand to cobalt.
  • This work expands the scope of accessible aNHC-metal complexes and their synthetic methodologies.