Abstract
An intramolecular homoannular alkylation of one ferrocenyl substituent in spirocyclodimers of 1,3-bis(ferrocenylmethylidene)-2-methylidenecyclohexanes and -cycloheptanes on treatment with trifluoroacetic acid, leading to the formation of polyfused products containing a three-petal system of six-membered rings in the molecule center, was found. The structure of 11-ferrocenyl-6,14-bis(ferrocenylmethylidene)-2,3-ferroceno-1,2-tetracyclo[8.8.0.05,10.013,18]octadeca-2,13(18)-diene was established by X-ray diffraction analysis.
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