Method of preparing 3,4-dihydro-alpha-pyrones

Details Method of preparing 3,4-dihydro-alpha-pyrones Method of preparing 3,4-dihydro-alpha-pyrones

1984-11-21

1987-06-16

Milestone, Norma S.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D30932

Patent

active

046737510

ABSTRACT:
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.degree. and 400.degree. 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.

REFERENCES:
patent: 4562270 (1985-12-01), Schmidt
Hackh's Chemical Dictionary, 4th Edition, p. 734.

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