- Fluoroalkylation of thiophenols with Freons using conjugated electron transfer mediator systems composed of methylviologen-SO2 and I2-SO2
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Methylviologen-sulfur dioxide and iodine (iodide)-sulfur dioxide have been shown to mediate electron transfer from thiophenols to Freons and perform the fluoroalkylation of thiophenols under mild conditions.
- Koshechko,Kiprianova,Fileleeva,Tsanov
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- METHOD FOR PREPARING A SULFONIMIDE COMPOUND AND SALTS THEREOF
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The present invention relates to a method for preparing an aqueous sulfonimide compound of the formula (Rf1—SO2) (Rf2—SO2)NH, wherein Rf1et Rf2 are independently selected from the group comprising: a fluorine atom and groups having 1 to 10 carbon atoms selected from the perfluoroalkyl, fluoroalkyl, fluoroalkenyl and fluoroallyl groups, from a mixture M1 including (Rf1—SO2)(Rf2—SO2)NH, Rf1SO2H and/or Rf2SO2H, Rf1SO2NH2 and/or Rf2SO2NH2, characterized in that said method includes an oxidation step of said mixture M1 using an oxidizing agent in order to obtain a mixture M2 including (Rf1—SO2)(Rf2—SO2)NH, Rf1SO3H and/or Rf2SO3H, and Rf1SO2NH2 and/or Rf2SO2NH2.
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Paragraph 0365; 0366
(2015/07/27)
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- METHOD FOR PREPARING TRIFLUOROMETHANESULPHINIC ACID
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The present invention relates to a method for preparing a highly pure trifluoromethanesulphinic acid. The method of the invention for preparing a highly pure trifluoromethanesulphinic acid, starting from an aqueous mixture comprising a trifluoromethanesulphinic acid salt, a trifluoroacetic acid salt and saline impurities resulting from the method for preparing same, is characterized in that said mixture is subjected to the following operations:- acidification such that the trifluoroacetic acid salt and the triflinic acid salt are released in an acid form,- separation of the trifluoroacetic acid and trifluoromethanesulphinic acid by distillation enabling the trifluoroacetic acid to be recovered at the top of the distillation and the trifluoromethanesulphinic acid to be recovered at the bottom of the distillation,- separation by distillation of the trifluoromethanesulphinic acid present in the distillation residue previously obtained.
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Page/Page column 3
(2012/08/08)
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- THE SYNTHESIS, SOLVOLYSIS AND REARRANGEMENT OF BENZYL TRIFLUOROMETHANESULFINATES
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The synthesis and reactivity of benzyl trifluoromethanesulfinates have been investigated.These esters are easily and almost quantitatively obtained by selective oxidation of the corresponding sulfenates.A study of their behavior has revealed some unique features.In sharp contrast to benzyl arenesulfinates, which undergo ethanolysis with complete sulfur-oxygen bond fission, the corresponding trifluoromethanesulfinates undergo ethanolysis with exclusive carbon-oxygen bond fission, and with a rate enhancement by a factor of 6 powers of ten.The unusual high reactivity of these esters, comparable to that of the corresponding tosylates, is discussed.A kinetic study of the solvent and substituents effects on the rate of solvolysis has been performed.Also in contrast with benzyl arenesulfinates, these esters undergo facile rearrangement to sulfone on heating in polar nonhydroxylic solvents such as acetonitrile, in high yields.The mechanisms of solvolysis and rearrangement are discussed.
- Braverman, Samuel,Manor, Haim
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p. 357 - 365
(2007/10/02)
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