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- W2035861015 abstract "L'irradiation des dichloro-3,5 -3,4 et -2,4 phe´nols conduita`la rupture d'une liaison C-Cl avec formation de HCl. Les dichloro-3,5 et -3,4 donnent lieu aa`une photohydrolyse spe´cifique en position 3 avec des rendements quantiques de0,11±0,02 pour les deux formes anioniques et respectivement de0,03±0,008 et0,020±0,004 pour les deux formes mole´culaires. Le dichloro-2,4 phe´nol a, par contre, un comportement diffe´rent et conduit comme le chloro-2 phe´nola`une re´action de photocontraction du cycle aromatique avec un rendement quantique de0,10±0,02 pour la forme anionique et de0,01 − 0,02 pour la forme mole´culaire. Avec les dichlorophe´nols, le chlore place´en position 4 est donc moins re´actif que ceux qui sont situe´s en position 2 et 3. La photohydrolyse intervient pre´fe´rentiellement sur la position 3 et elle est plus facile avec les formes anioniques qu'avec les formes mole´culaires. The irradiation of 3,5-, 3,4- and 2,4-dichlorophenols induces a C-Cl bond scission with HCl formation. With 3,5- and 3,4-dichlorophenols, photohydrolysis occurs specifically on the meta position. The quantum yields are0.11±0.02 for the two anionic forms and respectively0.03±0.008 and0.020±0.004 for the two molecular forms. The behaviour of the 2,4-dichlorophenol is completely different: similar to 2-chlorophenol, a photocontraction of the aromatic ring is observed with a quantum yield of0.10±0.02 for the anionic form and0.01 − 0.02 for the molecular one. With dichlorophenols the chloride located in para position is less reactive than those located in ortho and meta positions. The photohydrolysis occurs preferentially on meta position and is easier with anionic forms than with molecular ones." @default.
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- W2035861015 date "1984-01-01" @default.
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- W2035861015 title "Photochimie et environnement VIII- Comportement photochimique de dichlorophenols en solution aqueuse diluee" @default.
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- W2035861015 doi "https://doi.org/10.1016/0045-6535(84)90197-8" @default.
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