SEARCH Articles Figures Tables Aminium cation radicals Diels-Alder reactions Cation Diels-Alder reaction Cationic reactions Diels-Alder reactions of radical cations Diels-Alder reactions radical Diels-Alder reactions radical cation-catalysed Radical cation reactions Radical cations in Diels-Alder reactions Vinylcyclohexenes, radical cations retro-Diels-Alder reaction