Aromatic by all definitions: Metallabenzenes are known to exhibit the physical properties of aromatic systems (ring planarity, equidistant C−C arene bonds, appropriate downfield NMR shifts). Now in addition, a classical chemical attribute of aromatic compounds, namely the ability to undergo electrophilic aromatic substitution reactions, has been observed with the nitration and halogenation reactions of complex 1 (L=PPh3, X=I).
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Rickard et al. (2000) studied this question.
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