| 摘要 |
2(5H)-furanones I <IMAGE> (I) where R1 and R2 are each hydrogen, C1-C6-alkyl, C5- or C6-cycloalkyl, C7-C12-aralkyl or aryl, are prepared by heating a 3-formylcarboxylate or 3-formylcarboxylic acid II <IMAGE> (II) where R3 is hydrogen, C1-C12-alkyl, C5- or C6-cycloalkyl, C7-C12-aralkyl or aryl, to 100 DEG -450 DEG C. in the presence of an acidic catalyst.
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