SEARCH Articles Figures Tables Accidental symmetry-allowed Allowables Allowances Chemical reactions symmetry-allowed Concerted reactions symmetry allowed Conical intersection symmetry-allowed Correlation diagram symmetry-allowed Cycloadditions symmetry allowed Diels-Alder reaction symmetry-allowed process Hydrogen shift photochemically symmetry allowed Hydrogen shift symmetry allowed Molecular orbitals symmetry-allowed reactions Symmetry allowed and forbidden Symmetry allowed cycloaddition Symmetry allowed process Symmetry allowed reactions, definition Symmetry controlled reactions allowed Symmetry, double point group, allowed Symmetry-allowed interactions Symmetry-allowed pathway Symmetry-allowed reactions Symmetry-allowed transitions The Diels-Alder Reaction. A Symmetry Allowed Process