Wavelength-dependent reactivity of a quinolinone: toward a photochromic three-state system.
The photochemical reactivity of the quinolinone 3 was investigated using NMR by monitoring its reactions under appropriate irradiation wavelengths. Besides the irreversible formation of degradation products which were structurally identified, the reversible formation of the enol 4 and cyclobutenol 5 was also observed. The enol and cyclobutenol can be switched or reversed back to the quinolinone 3, resulting in a photochromic three-state system in which the relative ratio of the three components largely depends on the irradiation wavelength used.
Berthet
Jérôme
J
CNRS UMR 8009, Lille 2 University, NMR and Photochemistry team, F-59006 Lille Cedex, France.
Micheau
Jean-Claude
JC
Lokshin
Vladimir
V
Vales
Magali
M
Vermeersch
Gaston
G
Delbaere
Stéphanie
S