Photochemical E ⇄ Z isomerization of some BENZYLIDENE CAMPHOR (cas 15087-24-8) and benzylidene tetrahydrofuranone derivatives

Add time:07/25/2019    Source:sciencedirect.com

The E ⇄ Z photoisomerization of BENZYLIDENE CAMPHOR (cas 15087-24-8) and benzylidene tetrahydrofuranone was examined in various solvents. The isomerization quantum yields determined from different methods were found to be independent of the concentration and of the irradiation wavelength. No solvent and oxygen effects were observed on this quantum yield. The kinetic constants of the thermal Z → E isomerization at 30 °C were calculated. A marked role of protic solvent on the reaction rate was found with the hydroxylated derivatives. The measured quantum yield of the irreversible phototransformation depends on the nature of the aromatic ring substituents and of the hydrogen-donor character of the solvent.

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