- A waiting carbon nitride radical anion: A charge storage material and key intermediate in direct C-H thiolation of methylarenes using elemental sulfur as the s -source
-
Potassium poly(heptazine imide), a carbon nitride based semiconductor with high structural order and a valence band potential of +2.2 V vs. NHE, in the presence of hole scavengers and under visible light irradiation gives the corresponding polymeric radical anion, in which the specific density of unpaired electrons reaches 112 μmol g-1. The obtained polymeric radical anion is stable under anaerobic conditions for several hours. It was characterized using UV-vis absorption, time resolved and steady state photoluminescence spectra. The electronic structure of the polymeric radical anion was confirmed by DFT cluster modelling. The unique properties of potassium poly(heptazine imide) for storing charges were employed in visible light photocatalysis. A series of substituted dibenzyldisulfanes was synthesized in 41-67% yield from the corresponding methylarenes via cleavage of the methyl C-H bond under visible light irradiation and metal-free conditions.
- Savateev, Aleksandr,Kurpil, Bogdan,Mishchenko, Artem,Zhang, Guigang,Antonietti, Markus
-
-
Read Online
- Preparation method of symmetric disulfide bond-containing compound
-
The method comprises the following steps: adding a raw material and an oxidant to a reaction bottle containing a solvent; reacting 23W - 85W under the irradiation of 12 - 24h energy-saving lamps; and purifying the reaction product to obtain symmetrical disulfide bond-containing compounds. The raw material is mercaptan or thiophenol. The oxidizing agent is trichlorobromomethane, and the solvent is tetrahydrofuran. The method has the advantages of simple operation, high yield (70 - 90%), wide applicability, cheap and easily available raw materials, and provides a better way for the synthesis and production of symmetrical disulfide bond-containing compounds.
- -
-
Paragraph 0020; 0084-0086
(2021/11/21)
-
- Unsymmetrical Disulfides Synthesis via Cs2CO3-Catalyzed Three-Component Reaction in Water
-
An unsymmetrical disulfides synthesis by Cs2CO3-catalyzed three-component coupling reaction of thioacetate, sodium thiosulfate, and benzyl halide in water is described. The safe, stable, and non-toxic Na2S2O3 was invoked as the sulfur-source, successfully avoiding the odor generation in the process of S?S bond formation. A wide range of substrate suitability and appropriate functional group tolerance were observed for the transformation. Notably, the approach reported here was compatible with various biomolecules including glucose, coumarin, and quinolinone. (Figure presented.).
- Wang, Dungai,Gao, Yuanji,Tong, Yunli,Xiong, Mingteng,Liang, Xiao,Zhu, Heping,Pan, Yuanjiang
-
supporting information
p. 4991 - 4995
(2020/09/23)
-
- Thermal conversion of primary alcohols to disulfides: Via xanthate intermediates: An extension to the Chugaev elimination
-
Primary alcohols are converted into dialkyl disulfides via heating in situ generated O-alkyl S-difluoro(ethoxycarbonyl)methyl xanthates from ethyl bromodifluoroacetate and potassium xanthates, prepared from primary alcohols and carbon disulfide in the presence of KOH. The reaction mechanism is suggested as an alkyl C[1,3] shift followed by a radical mechanism. This extends to the Chugaev elimination which yields olefins. The current research provides easy access to dialkyl disulfides from commercially available primary alkanols.
- He, Wei,Ding, Yong,Tu, Jianzhuo,Que, Chuqiang,Yang, Zhanhui,Xu, Jiaxi
-
p. 1659 - 1666
(2018/03/21)
-
- Diarylmethylene disulfide compound as well as preparation method and application thereof
-
The invention relates to the technical field of medicines and in particular relates to a diarylmethylene disulfide compound as well as a preparation method and application thereof. An experiment result shows that on a cell model, the diarylmethylene disulfide compound provided by the invention has an effect of inhibiting neurotoxicity caused by excessive glutamic acid and an effect of inhibiting neurotoxicity caused by hydrogen peroxide; the diarylmethylene disulfide compound also has a platelet aggregation resisting effect and can be used for reducing a cerebral infarct area in a mouse MCAO (Middle Cerebral Artery Occlusion) model. The results show that the diarylmethylene disulfide compound provided by the invention can have prevention and/or treatment effects on cerebral stroke.
- -
-
Paragraph 0055; 0056; 0057; 0058; 0059; 0120; 0121; 0122; 01
(2018/01/03)
-
- Alternative Protocol for the Synthesis of Symmetrical Dibenzyl Diselenides and Disulfides
-
A one-pot protocol for the preparation of symmetrical dibenzyl diselenides and disulfides from the corresponding benzyl alcohols employing NaBH2Se3 and NaBH2S3 as selenium-transfer and sulfur-transfer reagent, respectively, is described. Structurally diverse substituted benzyl alcohols afforded the corresponding diselenides and disulfides in good to excellent yields. The protocol is simple and mild, and the products were obtained within a short reaction time.
- Panduranga, Veladi,Prabhu, Girish,Panguluri, Nageswara Rao,Sureshbabu, Vommina V.
-
p. 1711 - 1718
(2016/06/01)
-
- Deep eutectic mixture catalysed the synthesis of disulfides using Bunte salts as thiol surrogates
-
Bunte salts, easily prepared from odourless sodium thiosulfates and various alkyl and aryl halides, acted as thiol surrogates for preparation of disulfides in the presence of hydrogen peroxide and a Bronsted-acidic deep eutectic mixture. The reaction proceeded smoothly to give the corresponding disulfide products in moderate to good yields, leaving odourless sodium bisulfite and water as the by-products. Moreover, this catalytic system could be readily recovered and reused several times without significant loss in activity.
- Zhou, Yongsheng
-
p. 332 - 335
(2015/08/18)
-
- Electron transfer to sulfides and disulfides: Intrinsic barriers and relationship between heterogeneous and homogeneous electron-transfer kinetics
-
The electron-acceptor properties of series of related sulfides and disulfides were investigated in N,N-dimethylformamide with homogeneous (redox catalysis) and/or heterogeneous (cyclic voltammetry and convolution analysis) electrochemical techniques. The electron-transfer rate constants were determined as a function of the reaction free energy and the corresponding intrinsic barriers were determined. The dependence of relevant thermodynamic and kinetic parameters on substituents was assessed. The kinetic data were also analyzed in relation to corresponding data pertaining to reduction of diaryl disulfides. All investigated reductions take place by stepwise dissociative electron transfer (DET) which causes cleavage of the Calkyl-S or S-S bond. A generalized picture of how the intrinsic electron-transfer barrier depends on molecular features, ring substituents, and the presence of spacers between the frangible bond and aromatic groups was established. The reduction mechanism was found to undergo a progressive (and now predictable) transition between common stepwise DET and DET proceeding through formation of loose radical anions. The intrinsic barriers were compared with available results for ET to several classes of dissociative- and nondissociative-type acceptors, and this led to verification that the heterogeneous and the homogeneous data correlate as predicted by the Hush theory.
- Meneses, Ana Belen,Antonello, Sabrina,Arevalo, Maria Carmen,Gonzalez, Concepcion Carmen,Sharma, Jadab,Wallette, Andrea N.,Workentin, Mark S.,Maran, Flavio
-
p. 7983 - 7995
(2008/04/01)
-
- Reduction of sulfur with borohydride exchange resin in methanol: Application to rapid and selective synthesis of disulfides
-
A convenient and rapid method for the synthesis of symmetrical disulfides from alkyl or aryl alkyl halides using sulfurated borohydride exchange resin (SBER) under anhydrous conditions is described. Selective transfer of sulfur to an alkyl group rather than an aryl group is achieved using this methodology.
- Bandgar,Uppalla,Sadavarte
-
p. 6741 - 6743
(2007/10/03)
-
- Benzyltriethylammonium tetrathiomolybdate: An improved sulfur transfer reagent for the synthesis of disulfides
-
Benzyltriethylammonium tetrathiomolybdate has been found to be a superior reagent for the conversion of alkyl halides to the corresponding disulfides in chloroform at room temperature.
- Ramesha,Chandrasekaran
-
p. 3277 - 3284
(2007/10/02)
-
- Novel Alkylation with Tetrathiotungstates and Tetrathiomolybdates: Facile Synthesis of Disulfides from Alkyl Halides
-
A novel reaction of alkyl halides with piperidinium tetrathiotungstate or piperidinium tetrathiomolybdate (MS42-) has been found to afford disulfides in good to excellent isolated yields under very mild reaction conditions.
- Dhar, Preeti,Chandrasekaran, Srinivasan
-
p. 2998 - 3000
(2007/10/02)
-