Wavelength-Dependent Reactivity of a Quinolinone: Toward a Photochromic Three-State System
Organic Letters2008Vol. 10(17), pp. 3773–3776
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Abstract
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.
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