Stable carbocations. Part 13. Intra-ionic cyclisation reactions of ferrocenyl- and phenyl-stabilised vinyl cations
Abstract
Ferrocenylvinyl cations bearing triarylmethyl, ferrocenylmethyl, ferrocenylcarbonyl, or cycloheptatrienyl groups attached to the vinylic β-carbon atom, and the phenylvinyl cation formed by protonation of 3-ferrocenyl-1-phenylpropyne undergo intra-ionic cyclisation to give a variety of novel mono-, bi-, and tri-cyclic derivatives.