SEARCH Articles Figures Tables 1,3-Dienes electrocyclic formation Acid-catalyzed electrocyclic formation Acid-catalyzed electrocyclic formation cyclopentenone Cyclohexadiene 1,3-, electrocyclic formation Cyclooctatriene, electrocyclic formation Cyclopentenyl cation electrocyclic formation Cyclopropyl cation electrocyclic formation Electrocyclic reaction ring formation