SEARCH Articles Figures Tables Alder Cycloaddition Cycloaddition reactions Diels-Alder reaction Cycloaddition reactions dienophile Diels cycloaddition Diels cycloaddition reactions Diels-Alder Dienophile Diels-Alder cycloaddition Diels-Alder cycloadditions Diels-Alder dienophiles Diels-Alder reaction 2 + 2] cycloaddition Dienophil Dienophile Dienophiles