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Stability and nitrosation efficiency of substituted N-methyl-N-nitrosobenzenesulfonamides

✍ Scribed by L. García-Río; J. R. Leis; J. A. Moreira; F. Norberto


Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
146 KB
Volume
11
Category
Article
ISSN
0894-3230

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✦ Synopsis


A series of substituted N-methyl- N-nitrosobenzenesulfonamides [2,4,6-(CH 3 ) 3 , 4-CH 3 O, 4-CH 3 , 4-Cl and 4-NO 2 ] were synthesized. All of them transfer their nitroso group to N-methylaniline in a quantitative manner, the more reactive being those substituted with electron-withdrawing groups, thus resembling some of the known alkyl nitrites. Studies of their acid denitrosation and base-catalysed hydrolysis demonstrated that the nitrosobenzenesulfonamides are fairly stable in aqueous media between pH 2 and 11. Their relative stability in aqueous media together with their ability to transfer the nitroso group to nucleophiles suggest their use as excellent alternatives to alkyl nitrites in both neutral and basic media.


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NMR spectra of p and rn-substituted phenyl N-methylcarbamates, phenyl Nfl-dimethylcarbamates and p and m-suhstituted phenyl propionates were recorded, and their para -C SCS (substituent chemical shW) were analysed by DSP (dual substituent parameters) and DSP-NLR (non-linear resonance) equations. It