Thiiranium ion
Web1 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 ... WebThe stable thiiranium ion (162) forms the same proportion of regioisomers (165) and (166) as formed by the addition of 4-chlorobenzenesulfenyl chloride (163) to methylpropene (164), when the two reactions are carried out in the same solvent and at the same temperature 〈87JOC2403〉 (Scheme 60). Either stable or intermediary thiiranium ions show high …
Thiiranium ion
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WebThe calculated results show that a thiiranium ion intermediate is preferentially generated and then transformed into a chiral aza-vinylidene quinone methide (aza-VQM) … 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
WebThe conversion of a di-tert-butyl-methylthiiranium ion into thietanium ion, that is reported in the literature as taking place spontaneously at 25 °C in a CD2Cl2 solution, has been … 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 …
WebThiiranium and Thiirenium Ions Chemistry and Stereochemistry. Phosphorus, Sulfur, and Silicon and the Related Elements 1994, 95 (1-4) , 265-282. … WebABSTRACT. 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 …
WebThiiranium ions, electrophilic addition with Alkenes and alkynes react with sulfur dichloride (SC12), giving 2-chloroethyl(or vinyl) sulfenyl chlorides . The reaction is an electrophilic …
WebUpon 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 ... is canada a service or goods-based economyWeb22 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; ruth brayer handwriting expertWebThiiranium 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 … ruth brandtWebThiiranium 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- … ruth brecherWebTranslations in context of "produits par l'Établissement" in French-English from Reverso Context: les aliments pour animaux ont été produits par l'établissement expéditeur, ou par un autre établissement figurant sur la liste visée au point b), ou dans la Communauté, is canada accepting migrantsWebThe trans-thiiranium ion and the thiirenium ion rearrange by methyl migration, concerted with ring opening. The product of rearrangement of the thiirenium ion closes to a thietenium ion. Rearrangement of the cis-thiiranium ion presumably occurs also but it is obscured by faster reactions <1997JOC7018>. ruth breaker tigerton wiWeb8 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], … is canada accepting american tourists