Photodegradation of the Isoxazolidine Fungicide SYP-Z048 in Aqueous Solution: Kinetics and Photoproducts

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• 作者：Pengfei Liu ; Yanjun Xu ; Jianqiang Li ; Junli Liu ; Yongsong Cao ; Xili Liu
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2012
• 出版时间：November 28, 2012
• 年：2012
• 卷：60
• 期：47
• 页码：11657-11663
• 全文大小：447K
• 年卷期：v.60,no.47(November 28, 2012)
• ISSN：1520-5118

文摘

Previous research has demonstrated that 3-[5-(4-chlorophenyl)-2,3-dimethyl-3-isoxazolidinyl]pyridine (SYP-Z048), a newly developed nitrogen heterocycle substituted isoxazolidine compound, has good protective and curative activities against a wide range of fungal diseases of fruits and vegetables caused by Ascomycetes, Basidiomycetes, and Deuteromycetes. In this study, the photochemical behavior of SYP-Z048 was investigated in aqueous solution and in response to solar and low-pressure mercury ultraviolet (UV) lamp irradiation. SYP-Z048 photolysis was pH- and temperature-dependent and was described by a first-order degradation reaction. A total of 11 photoproducts were separated by high-performance liquid chromatography (HPLC) and solid-phase extraction (SPE) and were identified on the basis of ¹H and ¹³C nuclear magnetic resonance (NMR) and high-performance liquid chromatography鈥搈ass spectrometry (HPLC鈥揗S) spectra. The photoproduct structures and kinetics suggested that the phototransformation of SYP-Z048 occurred via multiple reaction pathways that included the cleavage of the N鈥揙 bond in the isoxazolidine ring and the dechlorination of the benzene ring.

Keywords:

SYP-Z048; photodegradation kinetics; photodegradation pathway; photoproducts