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• W2007483378 abstract "Light-induced nitration pathways of phenols are important processes for the transformation of pesticide-derived secondary pollutants into toxic derivatives in surface waters and for the formation of phytotoxic compounds in the atmosphere. Moreover, phenols can be used as ˙NO2 probes in irradiated aqueous solutions. This paper shows that the nitration of 4-chlorophenol (4CP) into 2-nitro-4-chlorophenol (NCP) in the presence of irradiated nitrate and nitrite in aqueous solution involves the radical ˙NO2. The experimental data allow exclusion of an alternative nitration pathway by ˙OH + ˙NO2. Quantum mechanical calculations suggest that the nitration of both phenol and 4CP involves, as a first pathway, the abstraction of the phenolic hydrogen by ˙NO2, which yields HNO2 and the corresponding phenoxy radical. Reaction of phenoxyl with another ˙NO2 follows to finally produce the corresponding nitrated phenol. Such a pathway also correctly predicts that 4CP undergoes nitration more easily than phenol, because the ring Cl atom increases the acidity of the phenolic hydrogen of 4CP. This favours the H-abstraction process to give the corresponding phenoxy radical. In contrast, an alternative nitration pathway that involves ˙NO2 addition to the ring followed by H-abstraction by oxygen (or by ˙NO2 or ˙OH) is energetically unfavoured and erroneously predicts faster nitration for phenol than for 4CP." @default.
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• W2007483378 date "2012-12-01" @default.
• W2007483378 modified "2023-10-15" @default.
• W2007483378 title "Theoretical and experimental evidence of the photonitration pathway of phenol and 4-chlorophenol: A mechanistic study of environmental significance" @default.
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• W2007483378 doi "https://doi.org/10.1039/c1pp05288h" @default.
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