2-Pyrones. XXVI. Alkylidene Methylglutaconic Acids and 3,6-Dialkyl-5-carboxy-5,6-dihydro-2-pyrones from Methyl β-Methylglutaconate and Ethyl Isodehydroacetate and their Isomerization and Decarboxylation
2-Pyrones. XXVI. Alkylidene Methylglutaconic Acids and 3,6-Dialkyl-5-carboxy-5,6-dihydro-2-pyrones from Methyl β-Methylglutaconate and Ethyl Isodehydroacetate and their Isomerization and Decarboxylation