Expedient Mechanosynthesis of N,N-Dialkyl Imidazoliums and Silver(I)-Carbene Complexes in a Ball-Mill
Résumé
The absence of solvent, associated with intensive mechanical agitation, allowed the first mechanosynthesis of high-value silver(I)-carbenec omplexes and the corresponding N,N-dialkylimidazolium precursors. This procedure gave outstanding results in terms of yield and reactiont ime, when compared to solution-based conditions previously described in literature, and was generalized to unprecedented compounds. Silver(I)-carbene complexes could either be obtainedf rom N,N-dialkylimidazolium salts or directly from imidazole and alkyl halides in ao ne-pot two-step procedure withouti solating the imidazolium intermediate. Additionally,a ne fficient one-pot three-step sequence, including imidazole alkylation, silver metalation, andtransmetalationi sr eported.
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