SEARCH Articles Figures Tables 2, propenoic 2-methyl-2-propenoic acid 2-propenoic acid methyl ester 3- -propenoate Acid-catalyzed syntheses Cycloaddition ester Esters cycloadditions Esters metalation Methyl 2-propenoate Methyl esters, synthesis Methylated metals Methylation, metal Propenoic Acid Synthesis cycloaddition Synthesis metal-catalyzed