Abstract
A new base-free entry to metal–aNHC compounds from metal–metal bonded bimetallic precursors and imidazolium salts is reported. Regioselective metalation proceeds via C–I oxidative addition of an annulated imidazo[1,2-a][1,8]naphthyridine system to [RuI–RuI], [RhII–RhII], and [PdI–PdI] single bonds, affording C5-bound (abnormal) RuII–, RhIII–, and PdII–NHC compounds, respectively, at room temperature and in high yields.
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