(2,5)-Di:methyl-(3)-carboxy-tetra:hydro:furanone - useful as intermediate for perfuming agent

摘要

of formula (I) is new. It has interesting properties and is useful as an intermediate for the perfuming agent 4-oxo-3-hydroxy-2,5-dimethyl-4,5-dihydrofuran. The parent patent concerned the 1-6C alkyl esters of cpd. (I) and it may be prepd. from these by saponification under mild conditions using NaHCO3, Na2CO3, NaOH or KOH. Alternatively it may be prepd. by hydrogenolysis of the corresp. benzyl esters using Pd or Pt or C, CaCO3, SiO2 or Al2O3 carriers and is ethyl acetate or dioxan as solvent.