SEARCH Articles Figures Tables Acidity in Diels-Alder Diels acid Diels-Alder catalysis Diels-Alder reaction acids Diels-Alder reactions Lewis acid catalysis Diels-Alder reactions catalysis In Diels-Alder reactions In Lewis acids Lewis acids Diels-Alder reaction Lewis acids acid catalysis Lewis acids in Diels-Alder reaction Lewis acids, catalysis Lewis catalysis Lewis reactions