The kinetics of hydrolysis of the carbamoyl group in salicylanilide N-methylcarbamate (I) and 4-biphenylyl N-methylcarbamate (11) showed that the reaction was first order with respect to both hydroxide ion and carbamate. At 37", the hydroxideion-catalyzed hydrolysis of 1 to yield salicylanilide (111
Chromatography of N-methylcarbamates in the gaseous phase
β Scribed by Larry Wheeler; Allen Strother
- Publisher
- Elsevier Science
- Year
- 1969
- Tongue
- English
- Weight
- 710 KB
- Volume
- 45
- Category
- Article
- ISSN
- 1873-3778
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β¦ Synopsis
Gas-liquid chromatography was used to successfully separate certain pesticidal phenyl N-mcthylcarbamates from their phenolic moieties. A slightly polar 3 y,& OV-17 liquid phase was utilized and compared with a mixed liquid phase polarity column, 1.5 o/0 SE-30 and 2 o/o Carbowas zoM. Retention times, carbamate to phenol ratios, peak symmetry values and height equivalent to a theoretical plate values are reported as functions dependent on temperature. Small amounts of breakdown products were observed with a majority of tile compounds at rSo" on the OV-17 column.
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The reaction mechanisms of the alkaline hydrolysis of N-methylcarbamates were studied using the AM1 method by assuming two possible pathways: (1) nucleophilic attack of hydroxide ion on the car-bony1 carbon to give a tetrahedral complex followed by its breakdown to carbamic acid (BA,~); and (2) prot
A multi-residue method for the simultaneous extraction from drinking water using solid-phase extraction on LiChrolut EN [poly(styrene-divinylbenzene), PSDVB] and determination of nine N-methylcarbamate pesticides (NMCs) (aldicarb, its metabolites i.e. aldicarb sulfone and aldicarb sulfoxide and carb
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