Condensation of the prepared formyl ferrocene 6 with hydroxylammonium chloride gave ferrocenyl oxime 7, which was dehydrated to produce ferrocenyl nitrile 8. This nitrile was converted to new ferrocenyl tetrazol (9) using (n-C₄H₉)₃SnCl and NaN₃. In the presence of toluene-4-sulfonic acid (PTSA) the reaction between formyl ferrocene 6 and trimethyl orthoformate gave dimethyl acetal 10. Transacetalization of acetal 10 with (R)-(－)-3-chloro-1,2-propanediol furnished new ferrocenyl acetal 12, which was converted to ferrocenyl acetal 13 by a reaction with NaN₃. The new ferrocenyl acetal 15 was obtained by a reaction of acetal 10 with (R)-(－)-1-methoxy-2,3-propanediol (14), which was obtained by a reaction of (R)-(－)-3- chloro-1,2-propanediol with CH₃OH in the presence of NaOH. All of these new compounds were characterized by MS, ¹H NMR and IR spectra.

Key words: tetrazole, ferrocene, acetal, synthesis