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Chelating C4-bound imidazolylidene complexes through oxidative addition of imidazolium salts to palladium(0)

Krüger, Anneke ; Kluser, Evelyne ; Müller-Bunz, Helge ; Neels, Antonia ; Albrecht, Martin

In: European Journal of Inorganic Chemistry, 2012, p. -

Oxidative addition of donor-functionalised 4-iodoimidazolium salts to palladium(0) provides a selective route for the preparation of abnormal chelating N-heterocyclic carbene complexes and enables the introduction of a variety of donor groups. The activation of the C4 position does not necessitate protection of the imidazolium C2 position, thereby leaving this site available for further...

Palladation of diimidazolium salts at the C4 position: access to remarkably electron-rich palladium(II) centers

Heckenroth, Marion ; Kluser, Evelyne ; Neels, Antonia ; Albrecht, Martin

In: Dalton Transactions, 2008, p. 6242 - 6249

Palladation of C2-protected diimidazolium salts with Pd(OAc)₂ afforded complexes comprising C4-bound N-heterocyclic dicarbene ligands. The reactivity of these complexes towards Lewis acids (AgBF₄, AgOAc) and Brønsted acids (H₂SO₄, H₃PO₄, HOAc) revealed that abnormal C4 bonding of the carbenes markedly increases the nucleophilicity of the coordinated palladium center as compared to C2...

Neutral ligands with exceptional donor ability for Palladium-catalyzed alkene hydrogenation

Heckenroth, Marion ; Kluser, Evelyne ; Neels, Antonia ; Albrecht, Martin

In: Angewandte Chemie International Edition, 2007, vol. 46, no. 33, p. 6293 - 6296

Mild and rational synthesis of palladium complexes comprising C(4)-bound N-heterocyclic carbenes

Kluser, Evelyne ; Neels, Antonia ; Albrecht, Martin

In: Chemical Communications, 2006, p. 4495-4497

Oxidative addition of pyridyl-functionalised 4-iodoimidazolium salts to palladium(0) gives catalytically active complexes in which the N-heterocyclic carbene is bound to the palladium(II) centre in a non-classical bonding mode via C(4).