Alkylation of ferrocene with tetrachlorocyclopropene in the presence of AlCl 3 followed by aqueous workup affords 2,3-diferrocenylcyclopropenone in high yield. We have studied some of this ketone's chemical transformations and electrochemical properties. 2,3-Diferrocenylcyclopropenone withstands thermolysis; it is stable in an acidic medium; the action of tetrafluoroboric acid−diethyl ether results in the formation of diferrocenyl(hydroxy)cyclopropenylium tetrafluoroborate; nucleophiles, including methyllithium and lithium aluminum

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Dehydration of (E)-and (Z)-2-acetyl-1-ferrocenyl-3-methylbut-1-en-3-ols gave the corresponding (E)-and (Z)-2-acetyl-1-ferrocenyl-3-methylbuta-1,3-dienes, which have a crossconjugated system of three double bonds. These heterotrienes readily afford the products of linear and cyclodimerization by following a cationic cyclodimerization mechanism; they also form Diels−Alder adducts with azodicarboxylic and maleic acid N-phenylimides. The spatial structures of (E)-2-