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α kontra γ: Der Komplex [CpFe(CO)(PCy3)(BNCMes2)]+, der durch Halogenid‐Abstraktion synthetisiert wurde, ist das erste Beispiel eines BN‐Allenylidenanalogons und weist ein ungesättigtes MBNC‐π‐System auf. Obwohl DFT‐Rechnungen eine deutliche LUMO‐Amplitude an der γ‐Position (Kohlenstoff) zeigen (siehe Bild), greifen Nucleophile bevorzugt am sterisch weniger gehinderten α‐Zentrum (Bor) an.
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