β-Ferrocenyl-α,β-unsaturated Ketones. I. Condensation Reactions of Formylferrocene with Ketones

Abstract The condensation reaction of formylferrocene with simple aliphatic and alicyclic ketones, as acetone, ethyl methyl ketone, isobutyl methyl ketone, and cyclohexanone, in the presence of piperidine as a condensing agent afforded seven kinds of β-ferrocenyl-α,β-unsaturated ketones. The geometric configurations of the unsaturated ketones were discussed on the basis of their NMR spectra, and the influences of the ferrocenyl group on the π-π* transition bands in their UV spectra were also discussed.