SEARCH Articles Figures Tables Dienes heteroatom-substituted Dienes heteroatom-substituted Dienes substituted Heteroatom substitution Heteroatom-substituted Reactions of Achiral Carbonyl Dienophiles with Chiral Heteroatom-. substituted Dienes Reactions of Chiral Imines with Heteroatom-substituted Dienes Substitution heteroatom-substituted