- Hydrogen Sulfide Reactivity with Thiols in the Presence of Copper(II) in Hydroalcoholic Solutions or Cognac Brandies: Formation of Symmetrical and Unsymmetrical Dialkyl Trisulfides
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In the presence of copper(II), hydrogen sulfide reacts with thiols (methanethiol and ethanethiol) to yield symmetrical or unsymmetrical trisulfides (dimethyl trisulfide, diethyl trisulfide, and ethyl methyl trisulfide). In alcoholic beverages, these compounds are known for their nauseous character, reminiscent of onion smell, and for their low detection levels (dimethyl trisulfide: 0.1 μg/L). A mechanism for trisulfide formation is proposed that involves a two-step redox reaction.
- Nedjma, Mustapha,Hoffmann, Norbert
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- Sulfur-atom insertion into the S-S bond - Formation of symmetric trisulfides
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The reaction of triphenylmethanesulfenyl chloride (3a) with acyclic disulfides 4 or 5 give the respective trisulfides 1 or 2 in moderate to good yield and selectivity. A mechanism is advanced to explain the chemistry.
- Hou, Yihua,Abu-Yousef, Imad A.,Doung, Yen,Harpp, David N.
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p. 8607 - 8610
(2007/10/03)
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- New Routes to Poly(Alkylene Sulfidoselenides)
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A procedure was developed for preparing mixed poly(alkylene sulfidoselenides) by simultaneous dissolution of sulfur and selenium in basic reducing systems NaOH (KOH)-N2H4 * H2O-H2O, followed by alkylation of the resulting solutions with bielectrophilic agents.
- Deryagina, E. N.,Grabelnykh, V. A.,Russavskaya, N. V.,Alekminskaya, O. V.
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p. 1729 - 1733
(2007/10/03)
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- Formation of dialkyl polysulfides from vinyl ethers in the system H2S-DMSO-MOH
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The reaction of vinyl ethers with the system H2S-DMSO-MOH (30°C, 5 h) gives dialkyl polysulfides with a total yield of up to 65% instead of expected oxygen-containing thiols and sulfides. The ratio between dialkyl di-, tri-, and tetrasulfides depends on the nature of the vinyl ether and on the amount of alkali metal hydroxide in the reaction mixture. With di(propen-1-yl) ether, 4-methyl-2-ethyl-1,3-oxathiolane was also found as a by-product.
- Musorin,Sedunova,Trofimov
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p. 794 - 797
(2007/10/03)
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- SYNTHESIS OF DISULPHIDES AND TRISULPHIDES via ORGANOSILICON COMPOUNDS
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Silyl sulphides 2a-b smoothly react with thiolsulphinates 1a-c and thiolsulphonates 6a-c to give unsymmetrical disulphides under mild conditions and in very good yields.The "neutral" conditions used allow one to avoid any side reactions and subsequent randomization of the products.When bis(trimethylsilyl)sulphide, 8, is used, symmetrical trisulphides may be obtained under the same experimental conditions.
- Capozzi, Giuseppe,Capperucci, Antonella,Degl'Innocenti, Alessandro,Duce, Rosa Del,Menichetti, Stefano
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p. 421 - 426
(2007/10/02)
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- SILICON IN ORGANOSULFUR CHEMISTRY. Part 1. SYNTHESIS OF TRISULPHIDES
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The reaction of bis(trimethylsilyl)sulphide with thiosulphinates in an inert solvent under neutral and mild conditions gives symmetrical alkyl- or aryl-trisulphides.
- Capozzi, Giuseppe,Capperucci, Antonella,Degl'Innocenti, Alessandro,Duce, Rosa Del,Menichetti, Stefano
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p. 2991 - 2994
(2007/10/02)
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