Photo-Fries rearrangement of Phenyl salicylate (cas 118-55-8) studied by two-dimensional infrared spectroscopy☆
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Add time:08/26/2019 Source:sciencedirect.com
Photo-Fries rearrangement of Phenyl salicylate (cas 118-55-8) was examined by real-time infrared (IR) monitoring in conjunction with density functional theory (DFT) calculation. Changes in the spectral features were readily captured during the photo-induced chemical reaction of the phenyl salicylate by means of two-dimensional (2D) correlation spectroscopy. The obvious variations of spectral intensities due to the production of 2,2′-dihydroxybenzophenone and 2,4′-dihydroxybenzophenone are clearly identified to provide in-depth understanding to the photo-Fries rearrangement. Namely, when exposed to UV-irradiation, the majority of the phenyl salicylate undergoes photothermal degradation. Further irradiation to the rest of the phenyl salicylate then results in the production of 2,2′-dihydroxybenzophenone followed by the development 2,4′-dihydroxybenzo-phenome products. Such delay in the production of 2,4′-dihydroxybenzo-phenome implies the presence of some more pathways, which makes its reaction efficiency lower than that of 2,2′-dihydroxybenzophenone.
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