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Reaction of 4-hydroxy-6-methyl-2-pyrone with ethyl orthoformiate leeds by heating not to 6-methyl3(4-hydroxy-6-methyl-3(4-hydroxy-6-methyl-2-one-2Hpyron-3-yl)methylene-2(4)3H pyron-2,4-dione as previously reported in the literature, but to 3-acetoacetyl-7methyl-2H,5H pyrano-(4,3b)pyron-2,5-dione: C 13 H 9 0 6 , monoclinic system, space group  P 2 1 / a ,  a  = 7,244(3),  b  = 21,671(7),  c  = 7,459(4) Å,  β  = 102,75(2)°.

Structure cristalline et moléculaire de la 3-acétoacétyl-7-méthyl-2H,5Hpyrano-(4,3b)pyran-2,5-dione: C 13 H 9 0 6