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

C - Chemistry, Metallurgy

07

D

260/359.7

C07D 309/36 (2006.01) C07D 309/38 (2006.01)

Patent

CA 1166646

. - i - PATENT APPLICATION PAPERS OF Thomas R. Opie for PROCESS FOR THE PREPARATION OF 4-HYDROXY-6- METHYL-2-PYRONE Doc. No. 79-67 BJB:jd ABSTRACT OF THE DISCLOSURE 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 91% to about 99% culfuric acid (1-9% water content) at temperatures from about 60° to about 140°C. under pressures from about 10 millimeters of mercury to about 75 pounds per square inch wherein the sulfuric acid to pyran weight ratio is from about 0.8 to 1.0 to about 3.0 to 1.0 and isolating the 4-hydroxy-6-methyl-2-pyrone.

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