Photolysis of chlorsulfuron and metsulfuron-methyl in methanol

✍ Scribed by Yang, Xi; Wang, Xiaoshu; Kong, Lingren; Wang, Liansheng

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 81 KB
• Volume: 55
• Category: Article
• ISSN: 1526-498X
• DOI: 10.1002/(sici)1096-9063(199907)55:7<751::aid-ps10>3.0.co;2-q

✦ Synopsis

Photolysis of chlorsulfuron and metsulfuron-methyl was studied in methanol under UV light. Their rates of primary photolysis followed ®rst-order kinetics. The main photoproducts were identi®ed as 2-methoxy-4-methyl-1,3,5-triazin-6-amine, 2-chloro-benzenesulfonamide and methyl 2-(aminosulfonyl)benzoate, which entailed the cleavage of the two N±C ureic bonds. Further photolysis of benzenesulfonamide derivatives involved oxidation of ÀNH 2 , cyclisation with loss of CH 3 OH, and scission of the C±S bond A trace of methyl o-mercaptobenzoate was also detected. The corresponding photolysis pathways of chlorsulfuron and metsulfuron-methyl were tentatively proposed.