Diels-Alder reactions with 3,4-methylenedioxy-β-nitrostyrene : NMR studies of the structure and stereochemistry of adducts☆

Abstract Reaction between 3,4-methylenedioxy-β-nitrostyrene and 1-methoxybutadiene or methyl sorbate gave Diels-Alder adducts. Reaction between the dienophile and ethyl 5-chloro- or 5-benzoyl-oxypentadienoate gave either no reaction or aromatic products, (methylenedioxybiphenyl derivatives) derived from adducts. The structures of new compounds were obtained by NMR or by NMDR experiments.