Abstract
Β-Chloro-Β-ferrocenylacrylaldehyde, to which an s-cis configuration was assigned on the basis of the PMR spectral data, was synthesized from acetylferrocene by the Vilsmeier-Haack reaction. 2, 3, 6-Trisubstituted pyrylium salts with a ferrocenyl substituent in the 6 position were obtained by condensation of this aldehyde with Β-dicarbonyl compounds. The pyrylium salts were converted to the corresponding pyridines by the action of ammonium acetate in acetic acid. On the basis of the structures of the pyridines it was established that the aldehyde carbon atom initially attacks the Β-dicarbonyl compound with subsequent closing of the γ-unsubstituted pyrylium ring.
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