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Photochemical behaviour of dichlorprop [(±)‐2‐(2,4‐dichlorophenoxy)propanoic acid] in aqueous solution
Author(s) -
Meunier Laurence,
Gauvin Emmanuelle,
Boule Pierre
Publication year - 2002
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.537
Subject(s) - propanoic acid , chemistry , aqueous solution , photochemistry , chlorine , medicinal chemistry , stereochemistry , organic chemistry
Abstract 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. © 2002 Society of Chemical Industry