SEARCH Articles Figures Tables Electrocyclic Reactions and Cycloadditions Electrocyclic Reactions of Conjugated Dienes and Trienes Electrocyclic and Photochemical Reactions Electrocyclic and Sigmatropic Reactions as Cycloadditions Electrocyclic reaction HOMO and Highest occupied molecular orbital electrocyclic reactions and Photochemical Electrocyclic and Addition Reactions Photochemical Electrocyclic and Cycloaddition Reactions Some examples of photochemical cycloaddition and electrocyclic reactions