Photostability of hydroxyoxime extractants of metals 2. Photo-isomerization and photo-degradation of 2-hydroxy-5-methylbenzophenone (Z)-oxime

Add time:07/30/2019    Source:sciencedirect.com

The photo-isomerization and photo-degradation of 2-hydroxy-5-methylbenzophenone (Z)-oxime in ethanol, octane, toluene and a mixture of octane and toluene under an exposure to UV light is studied. The products of the photo-isomerization/photo-degradation are similar to those obtained during the photoreaction of (E)-oxime but the conversion rate and amounts of photo-degradation products are much higher. The photo-degradation of (Z)-isomer is quicker than its photo-isomerization to the (E)-isomer. The conversion of (Z)-oxime after 5 min of photoreaction is 84.7% in octane, 68.4% in a mixture of octane and toluene (4:1 v/v) and 58.2% in toluene. Large quantities of 3-phenyl-5-methylbenzisoxazole are formed at the beginning of photo-degradation, but the compound is unstable and its further degradation leads to 2-phenyl-5-methylbenzoxazole.

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