Synthesis, Characterization, and X‑ray Molecular Structure of Tantalum CCC-N-Heterocyclic Carbene (CCC-NHC) Pincer Complexes with Imidazole- and Triazole-Based Ligands

Unprecedented Ta bis­(NHC) pincer complexes have been synthesized and characterized by extension of the early-transition-metal amido methodology. The reaction of 1,3-bis­(3-butylimidazol-1-yl)­benzene diiodide (1) with stoichiometric and substoichiometric amounts of (tert-butylimido)­tris­(dimethyla...

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Bibliographic Details
Published in:Organometallics 2014-02, Vol.33 (4), p.952-958
Main Authors: Helgert, Theodore R, Hollis, T. Keith, Oliver, Allen G, Valle, Henry U, Wu, Yunshan, Webster, Charles Edwin
Format: Article
Language:English
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Summary:Unprecedented Ta bis­(NHC) pincer complexes have been synthesized and characterized by extension of the early-transition-metal amido methodology. The reaction of 1,3-bis­(3-butylimidazol-1-yl)­benzene diiodide (1) with stoichiometric and substoichiometric amounts of (tert-butylimido)­tris­(dimethylamido)­tantalum­(V) yielded (1,3-bis­(3-butylimidazol-1-yl-2-idene)-2-phenylene)­(tert-butylimido)­diiodotantalum­(V) (2) and (1,3-bis­(3-butylimidazol-1-yl-2-idene)-2-phenylene)­(tert-butylimido)­(dimethylamido)­iodotantalum­(V) (3). Use of excess (tert-butylimido)­tris­(dimethylamido)­tantalum­(V) to metalate 1,3-bis­(3-butylimidazol-1-yl)­benzene diiodide (1) yielded (1,3-bis­(3-butylimidazol-1-yl-2-idene)-2-phenylene)­(tert-butylimido)­(dimethylamido)­iodotantalum­(V) (3) exclusively. Furthermore, the first early-transition-metal (group 3–5) triazole-based NHC complex, (1,3-bis­(3-butyltriazol-1-yl-2-idene)-2-phenylene)­(tert-butylimido)­(dimethylamido)­iodotantalum­(V) (5), has been synthesized via amine elimination of 1,3-bis­(3-butyltriazol-1-yl)­benzene diiodide (4) with (tert-butylimido)­tris­(dimethylamido)­tantalum­(V).
ISSN:0276-7333
1520-6041
DOI:10.1021/om401063e