SEARCH Articles Figures Tables Annulations disrotatory ring closure Cyclobutene disrotatory ring opening Cyclopropyl cation, disrotatory ring opening Disrotatory Disrotatory electrocyclic ring closure thermal Disrotatory photochemical ring Disrotatory photochemical ring closure Disrotatory ring closur Disrotatory ring opening Disrotatory ring opening/closur Disrotatory, ring opening cyclobutenes Disrotatory-conrotatory ring opening Electrocyclic ring opening disrotatory Electrocyclic ring opening thermally forbidden disrotatory Electrocyclic ring-closure disrotatory Orbital correlation diagram cyclobutene, disrotatory ring opening Ring closure disrotatory Thermally forbidden disrotatory electrocyclic ring