Perspectives in Photochromism: A Novel System Based on the 1,5-Electrocyclization of Heteroanalogous Pentadienyl Anions†

摘要: The molecular process whereby light induces color changes in certain substances, namely photochromism, is currently a topic of active research. Many reactions—mainly monomolecular—have been reexamined greater detail from the standpoint photochromism. Those found to be especially suitable for such studies include cis-trans isomerizations, pericyclic reactions, tautomerizations and dissociations. most important this group are undoubtedly electrocyclization reactions. In paper we present spiro[fluorene-9,1′-[1,8a]-dihydroindolizine] its bis- tris-aza analogues as examples promising new system with wide range variability. Not only classical uses, but also those fields frequency doubling laser radiation, holography or microcircuit chips can now considered.