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Addition of N-ethylamine to a perfluoroalkylsulfonic acid chloride RFSO2Cl has been studied, to obtain the corresponding perfluoroalkylsulfonamide RFSO2NHC2H5. First a two-step synthesis has been considered : transformation of the perfluoroalkylsulfonic acid chloride RFSO2Cl to the corresponding fluoride RFSO2F, and addition of N-ethylamine; the study of the first step is reported. Then, a sulfonamide one-step synthesis involving a fluoride catalysis, is described.
- Benefice-Malouet,Blancou,Teissedre,Commeyras
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- New synthesis of polyfluoroalkanesulfonylureas
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This study describes a new synthesis of F-alkanesulfonyl ureas by reaction of the sodium salt of perfluoroalkane sulfonamide (RF = C4F9, C6F13) with some isocyanates in anhydrous THF. The perfluorinated sulfonylureas are obtained, in one step, from moderate to good yields.
- Benfodda,Delon,Guillen,Blancou
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p. 1353 - 1358
(2008/09/18)
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- Direct fluorination process for making perfluorinated organic substances
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A liquid phase process for making perfluorinated organic substances which comprises directly contacting in a temperature-controlled reactor a diluted solution or dispersion of a perfluorinateable, organic substance in a liquid, inert medium with a stoichiometric excess of fluorine gas, optionally diluted with an inert gas, to perfluorinate said organic substance at a temperature and a flow rate of inert gas (if used) sufficient to volatilize the resulting by-product hydrogen fluoride, removing said hydrogen fluoride from the reactor as it is produced, and separately removing from the reactor the resultant solution or dispersion of perfluorinated organic substance.
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