6-Acetyl-2,2-dimethyl-4-chromanone(6), isolated from Tussilago farfara LINN., was prepared by oxidation of 6-ethyl-2,2-dimethyl-4-chromanone(4) using chromium(VI) oxide in acetic anhydride and acetic acid.
The compound 4 was obtained, via the intermediate of ester 3, by condensation of p-ethylphenol and 3-methylcrotonic acid using diphosphorus pentaoxide in polyphsphoric acid.
The conversion of 3 to 4 also proceeds efficiently by stirring of the reaction mixture with glass globes in the absence of diphosphorus pentaoxide.

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Three new olefins, (5Z)-1, 5-undecadiene, (5Z)-1, 5-tridecadiene, (5Z, 8Z)-1, 5, 8-heptadecatriene were isolated together with sixteen volatile components from the buds of Tussilago farfara L.

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