Decomposition of Usnic Acid. III
On the Structure of Ethyl Acetusnetate
1952 年 72 巻 6 号 p. 825-829
詳細
1952 年 72 巻 6 号 p. 825-829
Since the proof given in earlier works is doubtful, the structure of ethyl acetusnetate was discussed again in the present paper.
On alkaline decomposition of ethyl C-methylacetusnetate, usnetic acid was obtained along with methylacetusnetol. By this result, the structure of ethyl acetusnetate was established as having a γ-substituted acetoacetic ester form of side-chain. Infrared absorption spectra of the condensation product of ethyl acetusnetate with resorcinol and the oxidative degradation product of diacetylusnic acid previously reported by us were measured, showing the former to be a coumarin derivative and obtaining a further evidence of the presence of coumaran-2-one structure in the latter compound.
