VERFAHREN ZUR HERSTELLUNG VON 3,4-DIHYDRO-(ALPHA)-PYRONEN

A method for the preparation of 3,4-dihydro-alpha-pyrones by the thermolysis of 5-hydroxymethyl-gamma-butyrolactone in a liquid medium at temperatures between 300 DEG and 400 DEG C. and in the presence of aluminosilicates as catalysts is disclosed. The dihydropyrone that forms is distilled out of th...

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Bibliographic Details
Main Authors MEYER,GUENTHER,.DR, STEFFEN,KLAUS-DIETER,.DR
Format Patent
LanguageGerman
Published 05.06.1985
Edition3
Subjects
CHEMISTRY
HETEROCYCLIC COMPOUNDS
METALLURGY
ORGANIC CHEMISTRY
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Summary:A method for the preparation of 3,4-dihydro-alpha-pyrones by the thermolysis of 5-hydroxymethyl-gamma-butyrolactone in a liquid medium at temperatures between 300 DEG and 400 DEG C. and in the presence of aluminosilicates as catalysts is disclosed. The dihydropyrone that forms is distilled out of the reaction medium together with the reaction water immediately after its formation. Heat transfer oils, including, for example, polynuclear aromatic compounds joined together by methylene bridges or other bridge groupings, are especially suitable as heat transfer oils. The method has the advantage of permitting the temperature to be regulated within a definable range so that secondary reactions due to local overheating or imprecise temperature control occur to only a limited degree if at all.
Bibliography:Application Number: DE19833342598