Process for the preparation of 4-hydroxy-6-methyl-2-pyrone

Details Process for the preparation of 4-hydroxy-6-methyl-2-pyrone Process for the preparation of 4-hydroxy-6-methyl-2-pyrone

1982-06-04

1986-02-11

Fan, Jane T.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D30930

Patent

active

045700036

ABSTRACT:
This invention relates to a novel process for the preparation of 4-hydroxy-6-methyl-2-pyrone which comprises reacting 3-acetyl-6-methyl-2(H)-pyran-2,4(3H)-dione (dehydroacetic acid, "DHAA") with from 93% to about 99% sulfuric acid (1-7% water content) at temperatures from about 60.degree. to about 140.degree. C. under pressures from about 10 millimeters of mercury to about 75 pounds per square inch wherein the sulfuric acid to pyran weight ratio (H.sub.2 SO.sub.4 :DHAA) is from about 0.8:1 to about 3:1 and isolating the 4-hydroxy-6-methyl-2-pyrone.

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