SEARCH Articles Figures Tables 2-Alkenoic acids, 2-alkylmethyl esters 4- Alkenoic acids Diels acid Diels-Alder reaction acids Diels-Alder synthesis Esters synthesis via retro Diels-Alder reactions Retro Diels-Alder reaction Retro-Diels-Alder Retro-reaction Synthesis Diels-Alder reaction