SEARCH Articles Figures Tables 6- fulvene, reaction Fulven Fulvene Fulvene, 6,6-dimethylcycloaddition reactions benzocyclobutenes Fulvene, 6,6-dimethylcycloaddition reactions dienes Fulvene, 6,6-dimethylcycloaddition reactions nitropyridyl betaines Fulvene, 6,6-dimethylcycloaddition reactions retro Diels-Alder reaction Fulvene, 6,6-dimethylcycloaddition reactions tropones Fulvenes reactions