Stable carbocations. Part 18. Hydride-transfer reactions of [(η5-cyclohexadienyl)(η5-cyclopentadienyl)iron]alkylium ions

Abstract

In solution in CF₃CO₂H, (η⁵-cyclohexadienyl)(η⁵-cyclopentadienyl)iron derivatives containing a C(OH)R¹R² substituent attached either to the cyclopentadienyl ring or to C(1) of the cyclohexadienyl ring are converted into (η⁶-arene)(η⁵-cyclopentadienyl)iron cations by hydroxy loss and hydride transfer. The mechanism of the reaction has been investigated using deuterium-labelled substrates.