Organometallics
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(
̈
compounds are “Dipolar five- (possibly six-) membered heterocyclic
compounds in which both the negative and the positive charge are
delocalized, for which a totally covalent structure cannot be written,
and which cannot be represented satisfactorily by any one polar
structure. The formal positive charge is associated with the ring atoms,
and the formal negative charge is associated with ring atoms or an
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(
Scientific Publications: Blackwell Oxford, UK, 1997. Formally, PYAs
are therefore not mesoionic, since a neutral resonance structure can be
drawn. However, we will use this term throughout this article to
acknowledge the resonance conjugation of the charges, while
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Organometallics XXXX, XXX, XXX−XXX