Document Detail

Kinetics and mechanism of the hydrolysis of thiamethoxam.
MedLine Citation:
PMID:  20183047     Owner:  NLM     Status:  MEDLINE    
The degradation of thiamethoxam [(EZ)-3-(2-chloro-1,3-thiazol-5-yl-methyl)-5-methyl-1,3,5-oxadiazinan-4-ylidene (nitro) amine] insecticide in buffers at different pH and temperature levels was investigated in laboratory studies. Acidic hydrolysis under conventional heating conditions and alkaline hydrolysis under both conventional heating and microwave conditions were carried out. Different hydrolysis products were found to form under alkaline and acidic conditions. Hydrolysis of thiamethoxam in acidic, neutral and alkaline buffers followed first-order reaction rate kinetics at pH 4, 7 and 9.2, respectively. Thiamethoxam readily hydrolyzed in alkaline buffer but was comparatively stable in neutral buffer solution. The main products formed under different conditions were characterized on the basis of infrared (IR), (1)H-NMR and Mass spectroscopy. The possible mechanisms for the formation of these hydrolysis products have also been proposed.
Rajib Karmakar; Shashi B Singh; Gita Kulshrestha
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes     Volume:  44     ISSN:  1532-4109     ISO Abbreviation:  J Environ Sci Health B     Publication Date:  2009 Jun 
Date Detail:
Created Date:  2010-02-25     Completed Date:  2010-05-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7607167     Medline TA:  J Environ Sci Health B     Country:  England    
Other Details:
Languages:  eng     Pagination:  435-41     Citation Subset:  IM    
Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi -110012, India.
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MeSH Terms
Chromatography, High Pressure Liquid
Hydrogen-Ion Concentration
Insecticides / chemistry*
Mass Spectrometry
Nitro Compounds / chemistry*
Oxazines / chemistry*
Thiazoles / chemistry*
Reg. No./Substance:
0/Buffers; 0/Insecticides; 0/Nitro Compounds; 0/Oxazines; 0/Thiazoles; 153719-23-4/thiamethoxam

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