13C and1H NMR spectra and stereoconfiguration of 1,4-adducts of the Diels-Alder reaction of furan with methyl acrylate and maleic anhydride

¹³C and¹H NMR spectra were taken for the 1,4-adducts of furan with methyl acrylate and maleic anhydride. The¹³C chemical shifts are characteristic: these values for C¹, C³, and C⁶ (adducts (I) and (II)) and C¹, C⁴ C², C³, C⁵, and C⁶ (adducts (III) and (IV)) depend on the orientation of the substituent at C² in the case of methyl acrylate and at C² and C³ in the case of maleic anhydride and may be used for the assignment of the adducts to the endo and exo isomers.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1669–1671, July, 1990.