Mesoionic carbenes (MICs), derived from alkylation and deprotonation of triazoles, are shown to form stable complexes with BH 3 . The synthesis of triazoles via Huigsen cycloadditions provides considerable structural diversity. Several routes to MIC−boranes are described, and their structures have been characterized by X-ray crystallography. As predicted on the basis of the increased σ-donor capacity of MICs by comparison to NHCs, the MIC−borane adducts are more reactive reducing agents. ■ ASSOCIATED CONTENT * S Supporting InformationText, figures, a table, and CIF files giving full experimental details and spectroscopic and characterization data for new compounds and crystallographic data for 1a−c,f. This material is available free of charge via the Internet at http://pubs.acs.org.
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