Photochemical behaviour of dichlorprop [(+/-)-2-(2,4-dichlorophenoxy)propanoic acid] in aqueous solution.
Aqueous solutions of dichlorprop were irradiated under different conditions of pH, wavelength and oxygenation. The photochemical behaviour was found to be complex and many photoproducts were formed. However, at low concentrations the main photoproducts were 4-chloropyrocatechol, 2-chlorophenol, 4-chlorophenol and 2,4-dichlorophenol. Some other photoproducts were identified, namely 2-(4-chloro-2-hydroxyphenoxy)propanoic acid, 2-(3,5-dichloro-2-hydroxyphenyl)propanoic acid and 2,4-dichlorophenyl acetate. From comparison with results previously obtained with mecoprop [2-(4-chloro-2-methylphenoxy)propanoic acid] it appears that the presence of a chlorine atom in position 2 on the ring strongly modifies the photochemical behaviour.
Laboratoire de Photochimie Moléculaire et Macromoléculaire, Université Blaise Pascal (Clermont-Ferrand), CNRS UMR 6505, F-63177 Aubière, France.
Laurence
L
Meunier
Emmanuelle
E
Gauvin
Pierre
P
Boule
D015084:2,4-Dichlorophenoxyacetic Acid / Q000031:analogs & derivatives* / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D015394:Molecular Structure; D010100:Oxygen / Q000494:pharmacology; D010782:Photolysis / Q000528:radiation effects*; D012996:Solutions / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D014466:Ultraviolet Rays; D014867:Water / Q000737:chemistry
D012996:Solutions; D014867:Water; D015084:2,4-Dichlorophenoxyacetic Acid; C010571:dichlorprop; D010100:Oxygen