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DLMUCIC ACIDtfLACTONE ETHYL ESTER
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5-acetylvanillin absolute ethyl absolute methanol acetate acetone acid diamide acid-tf-lactone ethyl ester added aldehyde allowed to cool Anal analytical sample benzene benzofuran benzopyrone Calcd carbon carbonyl group catalyst chalcone Chem CHOH colorless needles compound creosol crystallized D,L-methyl ethyl mucate diethyl mucate dioxane dried at room ether ethyl alcohol ethyl hydrogen mucate extracted flask equipped flavanone Freudenberg gamma lactones gave the analytical Glattfeld heated hydrochloric acid hydrogen chloride isoeugenol isomerization ketonic lactone lactone ethyl ester lignin ligninsulfonate maxima melting point methanol microcrystalline solid mixture was allowed model flavanone mole mucic acid mucic acid monolactone obtained phenolic phenolic group platinum oxide polymer potassium hydroxide presence procedure proposed reaction recrystallized reduced pressure reflux condenser residual room temperature side chain sodium solid was filtered solvent spectra spectrum of lignin steam bath steam distillation structure sulfonate synthesis syrup tion ultraviolet ultraviolet spectrum vanillin Weerman test weight yellow needles yield