Diferrocenyl(methylthio)cyclopropenylium iodide reacts with organometallic compounds (methyllithium, benzyl-and ethylmagnesium chlorides, and allylmagnesium bromide) to yield 2,3-diferrocenyl-1-methylthio-1,3-dienes or -1,3,5-triene together with 3,3-dialkyl-1,2-diferrocenylcyclopropenes.

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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Reactions of arene-and pyridinecarbaldehydes with ferrocenyl-4,5-dihydropyrazoles afforded 1-arylmethyl-and 1-pyridylmethyl-3,5-aryl(ferrocenyl)pyrazoles. Their structures were established based on spectroscopic methods and, for 4-[(3,5-diferrocenylpyrazol-1-yl)methyl]pyridine, based on X-ray diffraction analysis.