| 摘要 |
The present invention relates to a process for the preparation of 3,4-dihydro-4,4-dialkyl- alpha -pyrones by thermolysis of 3,4-dihydro-5-hydroxymethylfuranonecarboxylates. According to the invention, those carboxylates of the abovementioned furanones are employed for the thermolysis in which the carboxylic acid radical has more than 7 C atoms. When these starting materials are employed, the desired dihydro- alpha -pyrone can be obtained directly without being contaminated with the carboxylic acid which forms during hydrolysis. Accordingly, a separation of pyrone and by-product can be dispensed with. The carboxylates of furanone, which are to be employed in the reaction according to the invention, are novel compounds and the subject of material claims.
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