BIPHOTOCHROMIC NORBORNADIENE SYSTEMS

Citation
Va. Bren et al., BIPHOTOCHROMIC NORBORNADIENE SYSTEMS, Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 297, 1997, pp. 247-253
Citations number
7
Categorie Soggetti
Crystallography
ISSN journal
1058725X
Volume
297
Year of publication
1997
Pages
247 - 253
Database
ISI
SICI code
1058-725X(1997)297:<247:BNS>2.0.ZU;2-0
Abstract
Novel biphotochromic systems containing two norbornadiene moieties in one molecule or one norbornadienyl group in adiene-2-carbonyl)]-N-aryl aminomethylene-(2H)benzo have been prepared. Under UV/VIS irradiation the latter compounds undergo Z/E-isomerization acompanied by N --> O a cyl rearrangement and valence isomerization in the norbornadiene fragm ent. Bis-norbornadienyl derivatives upon irradiation convert through s tepwise isomerization into corresponding quadricyclanes. The back reac tions are catalyzed with trifluoroacetic acid at room temperature.