Thiiranium ion
WebThiiranium ions are attacked at carbon by most sulfur nucleophiles (79ACR282), but see Section 5.06.3.4.3 for exceptions. [Pg.161] Halide ions may attack 5-substituted thiiranium ions at three sites the sulfur atom (Section 5.06.3.4.5), a ring carbon atom or an 5- … Web10 Nov 2014 · The capture of the thiiranium ion formed from 1b, for example, in the presence of excess MsOH, is known to be reversible, even at low temperatures 21.
Thiiranium ion
Did you know?
Web8 Mar 2000 · Thiiranium ion intermediates have been generated by reactions of disulfides with alkenes in the presence of oxidants such as Pb(OAc) 4 [1,2,3,4], Mn(OAc) 3 [2,3,4], … WebFig. 1. Background and Synopsis of Current Work. a, Thiiranium-ion-mediated anti-selective 1,2- carbosulfenylation. b, This work: syn-selective 1,2-carbosulfenylation of unactivated alkenes with native directing groups. c, Nickel-catalyzed redox-neutral alkene 1,2-difunctionalization.d, Survey of carbon- and heteroatom electrophiles containing nitrogen …
Web25 Mar 2024 · The configurational stability, reactivity and selectivity of three-membered cationic “iranium ions” generated in situ from alkenes and their subsequent trapping by electron-rich aromatic compounds as … Web25 May 2024 · Functionalize through thiiranium ions: Sulfenyl group transfer to alkenes has emerged as a versatile tool for introduction of organosulfur moieties into molecules with high stereochemical control. Understanding the structure, formation, stability, and reactivity of the key intermediate thiiraniium ion, led to the development of catalytic …
Web1 Jun 1987 · The involvement of thiiranium ions (or other symmetrical intermediates) in solvolysis can, in principle, be detected by deuterating one of the methylene groups of the ethyl moiety and following the fate of the deuteriums (or, more conveniently, the … Web1 Mar 2009 · Ion-molecule reactions (IMR) between thiiranium ion 11 (m/z 213) and cyclohexene and cis-cyclooctene resulted in the formation of addition products 17a and 17b (m/z 295 and m/z 323 respectively ...
Web22 Jul 2024 · The reaction of the stable thiiranium ion, prepared by the reaction of trifluoromethanesulfonic acid and methyl-3-(4-chlorophenylthio)propene with tetraethylammonium chloride in either 3.5 or 36% ...
Webthiiranium ion, resulting in the corresponding acetamide.8 In fact, we had also observed what we presumed to be a Ritter side product previously, while developing an effective strategy towards catalytic asymmetric dihalogenation. During our opti-mizations, we had observed that although acetonitrile was doncaster dome what\u0027s onWeb23 Oct 2009 · Enantiomerically enriched thiiranium ions have been prepared by silver-assisted ionization of chlorosulfide at −20 °C. The absolute configurational stability of the ions has been investigated in detail and these chiral, nonracemic thiiranium ions are found to be configurationally stable. city of chatfield jobsWebUpon formation, the thiiranium ion is subsequently captured in a cascade-type reaction, wherein a ketone oxygen serves as the nucleophile to open the thiiranium ion and an alcohol provides the secondary cyclization to form biorelevant spiroketals. A variety of electron-rich and electron-neutral E-substituted styrenes form the desired ... doncaster dome swimming bookingWebThiiranium salts Electrophilic attack on the sulfur atom of thiiranes by alkyl halides does not give thiiranium salts but rather products derived from attack of the halide ion on the intermediate cyclic salt (B-81MI50602). Treatment of a s-2,3-dimethylthiirane with methyl iodide yields cis-2-butene by two possible mechanisms (Scheme 31). A stereoselective … doncaster dragons baseball clubcity of chatfield pay billWebABSTRACT. Ion–molecule reactions between thiiranium ion 11 ( m/z 213) and cyclohexene and cis -cyclooctene resulted in the formation of addition products 17a and 17b ( m/z 295 … city of chatfield mn facebookWebThiiranium and Thiirenium Ions Chemistry and Stereochemistry. Phosphorus, Sulfur, and Silicon and the Related Elements 1994, 95 (1-4) , 265-282. … doncaster drive medical centre northolt