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The electrophilicity of tricarbonyl(cycloalkadienylium)iron complexes like 1 was determined by measuring the rates of their reactions with nucleophiles like 2 to give the neutral complexes 3 [Eq. (a)]. This enables the integration of the electrophilicity scale of organometallic cations with that of carbenium ions. Counterion BF; R is, for example, Ph.
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Mayr et al. (1993) studied this question.
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