42977-21-9Relevant articles and documents
Oxidation chemistry of perfluoroalkyl-segmented thiols, disulfides, thiosulfinates and thiosulfonates: The role of the perfluoroalkyl group in searching out new chemistry
Brace, Neal O.
, p. 11 - 23 (2000)
The oxidation chemistry of perfluoroalkyl-segmented thiols, RF-R-SH (1), thiosulfinates, RF-R-S(O)S-R-RF (3), thiosulfonates, RF-R-S(O2)S-R-RF (4) and disulfides, RF-R-SS-R-RF (5) (in which RF=n-C6F13 or n-C8F17 and R=CH2CH2) is studied herein. Base catalyzed reaction of C6 thiol 1 with hydrogen peroxide gives pure disulfide 5, quantitatively. Other, less suitable methods for the oxidation of thiol 1 are also examined and compared. Selective oxidation of disulfide 5 by peroxy acids in chlorinated solvents gives excellent yields of thiosulfinate 3. Unlike their hydrocarbon analogues, which are unstable to heating or storage, the RF-segmented thiosulfinates 3 are relatively stable, crystalline compounds. Selective oxidation of 3 by sodium metaperiodate gives thiosulfonate 4 in high yield. Side reactions intervene with unfavorable conditions, or when peroxy acetic acid in acetic acid is used as oxidant,. Oxidation of 5 by hydrogen peroxide in low conversion gives 4 and two new compounds, 8 and 9. Compound 8 is n-C6F13S(O)2CH2CH2C 6F13 (probably the sulfinate ester and not the sulfone), and 9 is most likely the O,S-sulfenyl sulfinate or, possibly an isomer, the vic-disulfoxide. A free radical chain mechanism is proposed for conversion of 4 (or 9) to 8. Compounds 8 and 9 are stable in solution and are identified by MS/GC. In 3, 4 and 5, the ν CH bands correlate with NMR of CH2 at C(1) and C(2) positions, both 1H and 13C NMR. The RF-segment in these unique sulfur compounds enhances their utility and modifies their chemical and physical properties in important and interesting ways.
Exploiting Sm(ii) and Sm(iii) in SmI2-initiated reaction cascades: Application in a tag removal-cyclisation approach to spirooxindole scaffolds
Coote, Susannah C.,Quenum, Seidjolo,Procter, David J.
supporting information; experimental part, p. 5104 - 5108 (2011/08/07)
A tag removal-cyclisation sequence is described that is initiated by reduction using a Sm(ii) species and completed by a Sm(iii) Lewis acid that is formed in an earlier stage. Therefore, the reaction cascade utilises both oxidation states of a samarium reagent in discrete steps and allows access to privileged, pyrrolidinyl-spirooxindole scaffolds and analogues inspired by the anti-cancer natural product spirotryprostatin A. The Royal Society of Chemistry 2011.
Phase transfer synthesis of symmetrical di-terminally perfluorinated alkyl trithiocarbonates
Naud,Calas,Blancou,Commeyras
, p. 29 - 38 (2007/10/03)
Symmetrical di-terminally perfluorinated alkyl trithiocarbonates having the formula [F(CF2)n(CH2)mS]2CS (n = 4,6,8 m = 2 and n = 6,8 m = 11) were prepared in good yield under phase-transfer catalytic conditions starting from perfluoroalkyl alkyl iodides F(CF2)n(CH2)mI.