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Analysis of sulfonylurea herbicides by gas-liquid chromatography. 1. Formation of thermostable derivatives of chlorsulfuron and metsulfuron-methyl

Klaffenbach, Peter ; Holland, Patrick T ; Lauren, Denis R

Journal of agricultural and food chemistry, 1993-03, Vol.41 (3), p.388-395 [Periódico revisado por pares]

American Chemical Society

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Título:
Analysis of sulfonylurea herbicides by gas-liquid chromatography. 1. Formation of thermostable derivatives of chlorsulfuron and metsulfuron-methyl
Autor: Klaffenbach, Peter ; Holland, Patrick T ; Lauren, Denis R
Assuntos: CALOR ; CHALEUR ; CHROMATOGRAPHIE EN PHASE GAZEUSE ; CHROMATOGRAPHIE GAZ LIQUIDE ; CHROMATOGRAPHIE LIQUIDE HAUTE PRESS ; CROMATOGRAFIA DE GASES ; CROMATOGRAFIA GAS-LIQUIDO ; CROMATOGRAFIA LIQUIDA ALTA PRESION ; HERBICIDAS ; HERBICIDE ; METHYLATION ; METILACION ; RESISTANCE A LA TEMPERATURE ; RESISTENCIA A LA TEMPERATURA
É parte de: Journal of agricultural and food chemistry, 1993-03, Vol.41 (3), p.388-395
Notas: H60
9435457
ark:/67375/TPS-434HRC5V-5
istex:C5295B29FD25F096CF66CB32488D43682C2D871A
Descrição: A method is described to overcome the thermal instability of sulfonylurea herbicides and thus enable their analysis by gas chromatography (GC). Methylation of chlorsulfuron by diazomethane in a variety of solvents usually yielded N-methylchlorsulfuron as the predominant product. This derivative was not stable to GC conditions, forming the N-methylsulfonamide. With diazomethane in either acetone or ethyl acetate and with longer reaction times substantial quantities of the N,N'-dimethyl derivatives of chlorsulfuron and metsulfuron-methyl were formed, which were characterized by GC-MS (EI and CI). These derivatives were thermostable and gave symmetrical GC peaks with good responses to both electron capture and nitrogen-phosphorus detectors. Reaction conditions were optimized in ethyl acetate to maximize yields of the N,N'-dimethyl derivatives. Formation of the derivatives was shown to be linear over the range 0.1-10 micrograms, and they were suitable for determination at residue levels
Editor: American Chemical Society
Idioma: Inglês

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Analysis of sulfonylurea herbicides by gas-liquid chromatography. 1. Formation of thermostable derivatives of chlorsulfuron and metsulfuron-methyl

Klaffenbach, Peter ; Holland, Patrick T ; Lauren, Denis R

American Chemical Society

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