Aliphatic Disulfides Research Articles

Chemistry of Aliphatic Disulfides. V. Preparation of Some Open-chain Unsymmetrical Cystine Derivatives from Thioethers of Cysteine

<b>Chemistry of Aliphatic Disulfides. V. Preparation of Some Open-chain Unsymmetrical Cystine Derivatives from Thioethers of Cysteine</b>

Extreme pressure lubrication and wear. The chemical reactivity and the extreme pressure action of two aliphatic disulfides : A. Dorinson and V. E. Broman. ASLE Trans., 5 (1962) 75–90, Discussion p. 89–90; 18 figs., 3 tables, 17 refs.

Extreme pressure lubrication and wear. The chemical reactivity and the extreme pressure action of two aliphatic disulfides : A. Dorinson and V. E. Broman. ASLE Trans., 5 (1962) 75–90, Discussion p. 89–90; 18 figs., 3 tables, 17 refs.

Extreme Pressure Lubrication and Wear. The Chemical Reactivity and the Extreme Pressure Action of Two Aliphatic Disulfides

Reaction rates were studied for the action of di-tert-octyl disulfide and di-n-cetyl disulfide in white oil on iron powder over the temperature range 165–250 C. The data were fitted to the Arrhenius equation, and the tertiary disulfide was found to be 1500 times as reactive as the normal disulfide. White oil solutions of the two disulfides were subjected to the Falex test and to the four-ball extreme-pressure test, and the tertiary disulfide was found to be the more effective lubricant additive in these tests. Wear studies were carried out with a pin and disk apparatus under conditions which approximated the above bench tests as regards specimen material, rubbing speed and pressure. The complex nature of the course of wear made it difficult to compare the two disulfides quantitatively. It was found that the tertiary disulfide was 2 to 20 times as efficacious as the normal disulfide in reducing the terminal steady-state wear rate. By treating the additive action of the disulfides as a competition between t...

The Chemistry of Aliphatic Disulfides. III.1 Formation of Sulfides During Cleavage by Cyanide Ion2

The Chemistry of Aliphatic Disulfides. III.¹ Formation of Sulfides During Cleavage by Cyanide Ion²

A Synthesis of Unsymmetrical Aliphatic Disulfides1

A Synthesis of Unsymmetrical Aliphatic Disulfides¹

Cleavage of disulfide polymers. I. By inorganic sulfides

Although sodium disulfide is one of the chief reactants in the preparation of polymeric disulfides, it has the ability to cleave the disulfide links in the polymer, as is shown in this paper. This cleavage is responsible for losses in yield of polymer through solubilization of fragments of low molecular weight, but is it also necessary in producing high polymers. The unreactive terminal hydroxyl groups produced by the side reaction of alkaline hydrolysis of reactive chloride terminals would ordinarily limit the chain length of the polymer; however, the preferential solubilization of the terminal fragments, because of the hydrophilic hydroxy group, permits the molecular weight of the polymer to be increased greatly. An excess of sodium disulfide is thus needed in order to obtain disulfide polymers of high molecular weight, in contrast to the usual condensation polymerization wherein an exact equivalence of reactants is needed. The cleavage of the aliphatic disulfide groups in the polymer by aqueous sodium polysulfide is a reversible reaction with the equilibrium favoring re-formation of the disulfide linkage. The equilibrium is displaced if a reagent capable of binding sulfur is present. A mixture of sodium sulfide, in particular sodium hydrosulfide, with sodium sulfite can be used in an efficient and controllable manner to convert polymer disulfides of high molecular weight to polymers of low molecular weight with terminal thiol groups.

Separation of Aliphatic Disulfides and Trisulfides by Gas-Liquid Partition Chromatography

Separation of Aliphatic Disulfides and Trisulfides by Gas-Liquid Partition Chromatography

The Use of Bunte Salts in Synthesis. III. The Preparation of Aliphatic Disulfides1

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Use of Bunte Salts in Synthesis. III. The Preparation of Aliphatic Disulfides1Harry E. Westlake Jr. and Gregg DoughertyCite this: J. Am. Chem. Soc. 1942, 64, 1, 149–150Publication Date (Print):January 1, 1942Publication History Published online1 May 2002Published inissue 1 January 1942https://doi.org/10.1021/ja01253a040RIGHTS & PERMISSIONSArticle Views490Altmetric-Citations32LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (251 KB) Get e-Alerts Get e-Alerts