SEARCH Articles Figures Tables Cycloaddition reactions diene Diene Cycloaddition Diene reaction Dienes 3-1-4 cycloadditions Dienes cycloaddition Dienes cycloaddition reactions Dienes, reactions Hepta Hepta-1,6-dienes Hepta-2,5-diene Spiro cycloaddition reactions Spiro hepta-4,6-diene Spiro hepta-4,6-dienes