2991-84-6Relevant academic research and scientific papers
A NEW METHOD FOR RECOVERING WASTE ALKALINE PERFLUORO-n-BUTANESULFONATE
Conte, L.,Napoli, M.,Scipioni, A.,Guerrato, A.
, p. 277 - 283 (1991)
A new method for recovering perfluoro-n-butanesulfonic acid from its waste alkaline salts and re-converting it into the corresponding 2,2,2-trifluoroethyl ester alkylating agent is described.Alkaline perfluoro-n-butanesulfonate can be converted into the corresponding acid by treating it with gaseous HCl in methanol; perfluoro-n-butanesulfonic acid is then directly esterified by treatment with 2,2,2-trifluoro-ethanol in thionyl chloride.Easy procedures and high yields could make this method important for industial application, with possible economic and environmental benefits.
New synthesis of polyfluoroalkanesulfonylureas
Benfodda,Delon,Guillen,Blancou
, p. 1353 - 1358 (2008/09/18)
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.
A general method for the preparation of perfluoroalkanesulfonyl chlorides
Scott, Peter J.H.,Campbell, Ian B.,Steel, Patrick G.
, p. 1196 - 1201 (2007/10/03)
A mild two-step synthesis of perfluoroalkanesulfonyl chlorides starting from perfluoroalkyl iodides has been developed. Reaction of perfluoroalkyl iodides with sodium dithionite gave sodium perfluoroalkanesulfinate salts which were converted into perfluoroalkanesulfonyl chlorides in 25-73% yield (two steps) using N-chlorosuccinimide.
The activation of carbon-chlorine bonds in per- and polyfluoroalkyl chlorides: DMSO-induced hydroperfluoroalkylation of alkenes and alkynes with sodium dithionite
Long, Zheng-Yu,Chen, Qing-Yun
, p. 4775 - 4782 (2007/10/03)
In DMSO, the addition reactions of perfluoroalkyl chlorides, R(F)Cl, to alkenes or alkynes can occur smoothly in the presence of 1.5 equiv of Na2S2O4 and NaHCO3 at 75-80 °C for 4-10 h to give the corresponding adducts (RCH2CH2RF or RCH = CHR(F)). Ethyl chlorofluoro- (1f), chlorodifluoro- (1g) acetates, even nonfluorinated compounds, such as ethyl dichloro- (1h), chloro- (1i) acetates, and chloroform (1j) can undergo the similar reaction. Treatment of ω-iodo (or chloro-) perfluoroalkyl chlorides [X(CF2)(n) Cl, n = 2, 4, X= I or Cl] with > 3 equiv of alkenes and Na2SO4 gives directly the symmetrically disubstituted alkanes (RCH2CH2)2(CF2)(n). The symmetrically and unsymmetrically disubstituted adducts RCH2CH2(CF2)(n)CH2CH2R' from ω-iodoperfluoroalkyl chlorides can be also obtained stepwise, i.e., through the further addition reactions of monoadducts, RCH2CH2(CF2)(n)Cl to olefins. However, for α,ω- dichloroperfluoroalkanes, the similarly stepwise reactions with an alkene is not clean, both bis-adducts and the corresponding ω-hydrides, RCH2CH2(CF2)(n)H as byproducts are also formed. In the absence of alkenes or alkynes, per- and polyfluoroalkyl chlorides can be converted to their sulfinate salts and sulfonyl chlorides.
Preparation of 2-chloro-5-methyl-pyridine
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, (2008/06/13)
A process for the preparation of 2-chloro-5-methylpyridine of the formula STR1 which comprises reacting 3-methyl-pyridine-1-oxide of the formula STR2 with a chlorinating agent of the formula STR3 in which R1 represents alkyl, halogenoalkyl, cycloalkyl, optionally substituted aryl, NR2 R3 or OR4 in which R2 and R3 individually represent alkyl, cycloalkyl or aryl or together represent alkanediyl or oxaalkanediyl and R4 represents alkyl, cycloalkyl or optionally substituted aryl, in the presence of a basic organic nitrogen compound and in the presence of a diluent at a temperature between about -20° C. and +150° C.
Process for the preparation of perhaloalkanesulfinic and -sulfonic acids, perhaloalkanesulfinic and -sulfonic acid salts and other derivatives of these acids
-
, (2008/06/13)
A process for the preparation of perhaloalkanesulfinic and -sulfonic acids and derivatives of these acids. A perhaloalkanesulfinic acid salt is prepared by contacting a metal hydroxymethanesulfinate (preferably, a sodium, zinc or copper hydroxymethanesulfinate) with a perhaloalkyl halide group, in a polar solvent. Optionally, the perhaloalkanesulfinic acid salt is then converted to a perhaloalkanesulfinic or -sulfonic acid or a derivative of either of these acids.
