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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...
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