Substituted furanones as well as processes for the...

C - Chemistry – Metallurgy – 07 – D

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C07D 309/32 (2006.01) C07D 307/33 (2006.01) C07D 315/00 (2006.01)

Patent

CA 1227805

ABSTRACT OF THE DISCLOSURE: The present invention relates to a new process for preparing 3,4-dihydro-.alpha.-pyrones, by thermolysis of correspondingly substituted formic acid, acetic acid or propionic acid esters or alkylethers of dihydro-5-hydroxy methyl-furanones. The latter can be obtainable as new substances themselves from penten-4-carboxylic acid esters by reaction with hydrogen peroxide and the carboxylic acids or the alcohols or in the presence of bases, with dihydro- 5-halomethyl furanones. Furthermore, the dihydro-5- hydroxymethyl furanones can be prepared from the correspond- ing carboxylic acid esters or directly from unsubstituted or correspondingly substituted penten-4-carboxylic acid esters.

412450

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