Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 16, Issue 41, Pages 12454-12461Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201001447
Keywords
carbene analogues; heterocycles; N ligands; polycations; tellurium
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation
- University of Western Ontario
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The synthesis and comprehensive characterization of the first dicationic tellurium analogues of N-heterocyclic carbenes (NHCs) has been reported, in both the +2 and +4 oxidation states. For the +2 oxidation state, a base-stabilized form of TeCl2 is used as the starting material. The dications are isolated by means of halide metathesis and the solid-state structures confirm the previously calculated diimine bonding arrangement. For Te-IV, a diamine is used in a high-yielding dehydrohalogen coupling reaction from TeCl4. The dicationic NHC analogue is isolated in a base-stabilized form through halide abstraction and subsequent coordination by pyridine.
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