Ruthenium(II)-(Arene)-N-Heterocyclic Carbene Complexes: Efficient and Selective Catalysts for the N -Alkylation of Aromatic Amines with Alcohols

Abstract : A series of unsymmetrical 1,3-disubstituted benzimidazolium chlorides were synthesized as N-heterocyclic carbene (NHC) precursors. These compounds were used for synthesis of the new ruthenium(II) complexes of the type [RuCl2(arene)(NHC)], (arene = η 6-p-cymene). The structures of all compounds were characterized by 1 H NMR, 13 C NMR and FT-IR spectroscopy techniques. The catalytic activity of the ruthenium complexes has been evaluated with respect to the mono-N-alkylation reactions of aromatic amines with various alcohol derivatives under solvent-free conditions at 120 o C using the borrowing hydrogen strategy.
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Nazan Kaloğlu, Mathieu Achard, Christian Bruneau, Ismail Özdemir. Ruthenium(II)-(Arene)-N-Heterocyclic Carbene Complexes: Efficient and Selective Catalysts for the N -Alkylation of Aromatic Amines with Alcohols. European Journal of Inorganic Chemistry, Wiley-VCH Verlag, 2019, 2019 (21), pp.2598-2606. ⟨10.1002/ejic.201900191⟩. ⟨hal-02169359⟩

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