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Identification of photoproducts from imazosulfuron by HPLC
Author(s) -
Morrica Patrizia,
Fidente Paola,
Seccia Serenella
Publication year - 2004
Publication title -
biomedical chromatography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 65
eISSN - 1099-0801
pISSN - 0269-3879
DOI - 10.1002/bmc.335
Subject(s) - chemistry , photodegradation , cleavage (geology) , photodissociation , sulfur , high performance liquid chromatography , aqueous solution , photochemistry , chromatography , organic chemistry , catalysis , photocatalysis , geotechnical engineering , fracture (geology) , engineering
Photolysis of imazosulfuron was studied in aqueous solution under UV light. The reaction followed a pseudo‐rst‐order kinetic with signicant correlation coefcient. The major photodegradation products of imazosulfuron after irradiation under UV light were separated and tentatively identied by HPLC‐MS analysis as (4,6‐dimethoxypyrimidine‐2‐yl)aminocarbonylsulfamic acid, 4,6‐dimethoxy‐2‐ureidopyrimidine and 2,2′‐dichloro‐[3,3′] bi [imidazo[1,2‐a] pyridinyl]. The results indicate that different reaction pathways are followed: (1) cleavage of the sulfonylurea bridge; (2) desulfonylation, which can proceed either by a carbon–sulfur cleavage or a nitrogen–sulfur cleavage. A mechanism for the formation of the photoproducts is proposed. Copyright © 2004 John Wiley & Sons, Ltd.