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The TfOH-catalyzed reaction of aryl-substituted donor--acceptor cyclopropane derivatives with ferrocene provided new functionalized ferrocene derivatives. This process exhibited a reasonable scope with respect to the cyclopropane component affording the corresponding alkylated ferrocene derivatives in useful yields. An alternative approach to these functionalized ferrocene derivatives involving arylation of a ferrocene-decorated donor--acceptor cyclopropane derivative is also disclosed. Both processes rely on a facile regioselective ring-opening of the donor--acceptor cyclopropane. [ABSTRACT FROM AUTHOR]