SEARCH Articles Figures Tables 2-Pyrone from coumalic acid Coumalic acid 4,6-dimethyl Coumalic acid ETHYL ESTER Coumalic acid methylation reaction Coumalic acid, 4,6-dimethyl-, ethyl ester Coumalic acid, decarboxylation Coumalic acid, decarboxylation of, apparatus for Coumalic acid, decarboxylation of, apparatus for purification Coumalic acid, methyl ester Esterification, by azeotropic distillation of coumalic acid with methanol