Abstract
Reaction of N-heterocyclic carbenes with ferroborirene complex [{(η(5)-C5Me5)Fe(CO)2}{BC2(SiMe3)2}] results in heterolytic Fe-B bond cleavage, yielding borironium ions, a new class of boron-containing heterocycles. The reaction rests on the surprising ability of the reactive [(η(5)-C5Me5)Fe(CO)2](-) anion to act as a leaving group. The properties of these species were investigated by multinuclear NMR spectroscopy, as well as single-crystal X-ray diffraction.
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