Thiiranium ion
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. Web25 Mar 2024 · More recently, some of the co-operative catalytic systems such as phosphite-thiourea, sulfonic acid-phosphoramidite, sulfonic acid-selenophosphoramide, sulfonic acid-anion binding thiourea, etc. …
Thiiranium ion
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Web31 Jul 2024 · Thiiranium salt 11 (1 mmol, 635 mg), dissolved in THF (5 mL), was reacted with CsOH (2.5 mmol, 375 mg) in H 2 O or MeOH (3 mL) for 30 min at −40 °C, and stirred … WebTraductions en contexte de "n-acetonitrile" en anglais-français avec Reverso Context : glutamic acid n, n-diacetic amide, glutamic acid n-acetic amide n-acetonitrile, alkali metal salts thereof, process to prepare them and their use
WebThe sulfenyl group can be transferred from ion 209 (R = Ph) to (E)-octene between − 20 °C and − 10 °C, resulting in the formation of new thiiranium ion 210. The formed thiiranium ions trapped by methanol afforded two products, A and B, in a 1:10 ratio (Fig. 86). This reaction did not occur below − 20 °C, however, at 0 °C rapid ... 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 …
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% ... Web22 May 2009 · The role of thiiranium and thiirenium ions in the electrophilic additions to alkenes and alkynes and the corresponding inverse reactions, are revisited also in the light …
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- …
WebEnantiopure S -methylthiodinaphtho [2,1- c: 1′,2′- e ] [1,2]dithiinium hexachloroantimonate 3, transfers enantioselectively the MeS + group to trans -hex-3-ene, leading to non-racemic thiiranium ion 4, which, in turn, reacts with MeCN–H 2 O allowing the synthesis of optically active double functionalised alkanes with enantiomeric excesses of up … matthias berghoff neheimWebUpon 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 ... matthias berlingerWeb25 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 … matthias betzWeb1 Nov 1983 · The intramolecular rearrangement of bromonium ion into thiiranium ion has first been studied in the bromination of methylallyl sulfide [17]. In addition, this rearrangement has also been revealed ... here\u0027s a token of our appreciationWeb22 May 2009 · The role of thiiranium and thiirenium ions in the electrophilic additions to alkenes and alkynes and the corresponding inverse reactions, ... as a function of substitution pattern and on the enantioselective bifunctionalization of alkene via an optically active thiiranium ion are also reported. Key Words: thiiranium ions; thiirenium ions; matthias bergmannWebThe calculated results show that a thiiranium ion intermediate is preferentially generated and then transformed into a chiral aza-vinylidene quinone methide (aza-VQM) … matthias berger shopWebEnantiopure S -methylthiodinaphtho [2,1- c: 1′,2′- e ] [1,2]dithiinium hexachloroantimonate 3, transfers enantioselectively the MeS + group to trans -hex-3-ene, leading to non-racemic … matthias berghorn