Molecular and Crystal Structures of E- and Z-Isomers of 2,5-Dimethyl-3-furylethylidene(isopropylidene)-succinic Anhydride
Molecular and crystal structures of E- and Z-isomers of 2,5-dimethyl-3-furylethylidene(isopropylidene)-succinic anhydride were examined. Both isomers have structures twisting between the furan ring and the succinic anhydride portion. The photocyclization reaction is initiated by a π–π* transition from each part of the molecule, not from a π-orbital delocalized over the molecule.