FRAGMENTATION REACTIONS OF ERROCENYLVINYL)-4-(1-FERROCENYLVINYL)CYCLOHEXENES, ,5-DIFERROCENYL-4-(1-FERROCENYLVINYL)CYCLOHEXENES, AND RYL-1-FERROCENYL-4-(1-FERROCENYLVINYL)CYCLOHEXENES

Monocyclic ferrocenylsubstituted terpenoids, produced upon proton-indu ced cyclodimerization of ferrocenyl-1,3-dienes, undergo fragmentation under the action of electrophilic agents (HBF4, [PhCHFc]BF4, or [MeOC6 H4CHCHCHC6H4OMe]BF4) to give two molecules of methyl-, (2-ferrocenyl-2 -phenylethyl)-, or -bis(p-methoxyphenyl)-3-butenyl-ferrocenylallylium tetrafluoroborates. Treatment of these salts with dimethylaniline yiel ds, depending on their structure, the starting cyclodimers, seven-memb ered cyclic compounds, dimethylaniline alkylation products, or tricycl ic compounds.