Calcium Hydride Reactivity: Formation of an Anionic N-Heterocyclic Olefin Ligand |
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Authors: | Andrea Causero Holger Elsen Jürgen Pahl Prof?Dr Sjoerd Harder |
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Institution: | Inorganic and Organometallic Chemistry, Universität Erlangen-Nürnberg, Egerlandstrasse 1, 91058 Erlangen, Germany |
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Abstract: | An anionic N-heterocyclic olefin ligand was serendipitously obtained by reaction of an amidinate calcium hydride complex with 1,3-dimethyl-2-methyleneimidazole (NHO). Instead of anticipated addition to the polarized C=CH2 bond to form an unstabilized alkylcalcium complex, deprotonation of the NHO ligand in the backbone was observed. Preference for deprotonation versus addition is explained by loss of aromaticity in the latter conversion. Theoretical calculations demonstrate the substantially increased ylidic character of this anionic NHO ligand which, like N-heterocyclic dicarbenes, shows strong bifunctional coordination. |
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Keywords: | calcium carbene ligands hydrides N-heterocyclic olefin |
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