SEARCH Articles Figures Tables Acid-catalyzed Diels-Alder reaction Alder Cycloaddition Cycloaddition Lewis acids Cycloaddition reaction catalyzed Cycloaddition reactions Diels-Alder reaction Diels acid Diels cycloaddition Diels cycloaddition reactions Diels-Alder cycloaddition Diels-Alder cycloadditions Diels-Alder reaction 2 + 2] cycloaddition Diels-Alder reaction acids Lewis acid catalyzed reaction Lewis acid catalyzed reaction 4 + 21 cycloaddition Lewis acid-catalyzed Lewis acid-catalyzed Diels-Alder Lewis acids Diels-Alder reaction Lewis acids, -cycloadditions Lewis catalyzed Lewis reactions