S–S Bond Formation: Nanocatalysts in the Oxidative Coupling of Thiols

2017 ◽  
Vol 70 (1) ◽  
pp. 9 ◽  
Author(s):  
Lotfi Shiri ◽  
Arash Ghorbani-Choghamarani ◽  
Mosstafa Kazemi
Keyword(s):  
Catalytic Activity ◽  
Functional Groups ◽  
Oxidative Coupling ◽  
Biological Activities ◽  
Bond Formation ◽  
Sulfur Compounds ◽  
Organic Sulfur ◽  
Diverse Range ◽  
Organic Sulfur Compounds ◽  
Synthetic Intermediates

Compounds containing sulfur–sulfur bonds (often called disulfides or more specifically disulfanes) are arguably one of the most valuable functional groups in organic synthetic chemistry. They exist extensively in nature, in which they exhibit important biological activities. Furthermore, a diverse range of natural and synthetic disulfides have been discovered that have many applications as pharmaceutical and agriculture chemicals as well as synthetic intermediates. Since thiols are commercially accessible or easily synthesizable materials and their choice as starting materials is widely reported for the synthesis of organic sulfur compounds, unsurprisingly the oxidative coupling of thiols is the best and simplest route for the preparation of disulfides. In recent times, nanocatalysts have shown excellent catalytic activity and reusability in the oxidation of thiols to disulfides. Herein, we summarize the recently reported breakthroughs in the use of nanocatalysts for the oxidative coupling of thiols to their corresponding disulfides, with the goal of stimulating further progress in this field.

scholarly journals Transcriptome and phytochemical analyses provide insights into the organic sulfur pathway in Allium hirtifolium

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Aboozar Soorni ◽  
Amir Mohammad Akrami ◽  
Reza Abolghasemi ◽  
Maryam Vahedi
Keyword(s):  
Biological Activities ◽  
Transcriptome Profiling ◽  
Sulfur Compounds ◽  
Organic Sulfur ◽  
Important Species ◽  
Organic Sulfur Compounds ◽  
Bulb Formation ◽  
Resource Data ◽  
Genomic Resource ◽  
Allium Hirtifolium

AbstractAllium is one of the well-known genera of the Amaryllidaceae family, which contains over 780 species. Onions, garlic, leeks, and shallots are the most important species of this genus. Allium hirtifolium (shallot) is a rich source of proteins, carbohydrates, lipids, amino acids, and bioactive compounds such as organic sulfur compounds with an expansive range of biological activities and medicinal attributes. To identify the putative compounds and genes involved in the organic sulfur pathway, we applied GC–MS and RNA-seq techniques for the bulb, stem, and flower tissues of A. hirtifolium. The essential oil analysis revealed the maximum amount of sulfur compounds in stem against flower and bulb tissues. Transcriptome profiling showed 6155, 6494, and 4259 DEGs for bulb vs. flower, bulb vs. stem, and flower vs. stem, respectively. Overall, more genes were identified as being up-regulated rather than down-regulated in flower tissue compared to the stem and bulb tissues. Our findings in accordance with other results from different papers, suggest that carbohydrates are vital to bulb formation and development because a high number of identified DEGs (586 genes) were mapped to carbohydrate metabolism. This study has detected the genes in the organic sulfur pathway and indicated that the alliinase gene shows a high variability among different tissues. In general, this study formed a useful genomic resource data to explore tissue-specific sulfur pathway in A. hirtifolium, which is helpful for functional breeding.

Organic sulfur compounds containing functional groups

1982 ◽  
Vol 31 (6) ◽  
pp. 1225-1231
Author(s):  
A. R. Derzhinskii ◽  
V. E. Kalugin ◽  
E. N. Prilezhaeva
Keyword(s):  
Functional Groups ◽  
Sulfur Compounds ◽  
Organic Sulfur ◽  
Organic Sulfur Compounds

High Temperature Corrosion By Catalytically Formed Hydrogen Sulfide

CORROSION ◽  
1962 ◽  
Vol 18 (8) ◽  
pp. 291t-298t ◽  
Author(s):  
A. S. COUPER ◽  
ANDREW DRAVNIEKS
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Sulfide ◽  
High Temperature ◽  
Surface Concentration ◽  
High Temperature Corrosion ◽  
Sulfur Compounds ◽  
Organic Sulfur ◽  
Organic Sulfur Compounds ◽  
Steel Surfaces ◽  
Formed Hydrogen

Abstract Organic sulfur compounds are known to be a major cause of high-temperature corrosion in refining processes. Chromium steels are widely used in such environments. The required chromium content for adequate resistance depends upon the chemical form of sulfur encountered. Surfaces of corroding metals can act as catalysts in forming hydrogen sulfide, either from hydrogen and sulfur or by decomposition of organic sulfur compounds. Catalytically formed H2S is more corrosive than the same concentration of other H2S and can be corn-batted by adding chromium to the steel. Because corrosion is proportional to the concentration of H2S, a surface concentration of H2S is postulated as proportional to the catalytic activity of the surface. Laboratory tests on sulfur vapor mixed with hydrogen and on amyl mercaptan mixed with nitrogen or hydrogen indicate that corrosion is proportional to the yield of catalytically formed H2S. Chromium additions to the steel, oxide scales on the metal surfaces, additions of chlorides to the stream, and increased velocity decreased both H2S yields and corrosion, whereas increased temperatures and addition of oxidizing agents caused increases. Further work should be done to develop practical methods to reduce the catalytic activity of corroding steel surfaces, thereby improving corrosion resistance to certain high-temperature streams that contain sulfur compounds. 3.4.2, 4.4.9, 3.5.9, 3.7.2, 8.4.3

scholarly journals Pollution status of volatile organic sulfur compounds causing odor in Xi River and factors influencing spatial distribution

2020 ◽  
Vol 20 (4) ◽  
pp. 1264-1270
Author(s):  
Xiang Tu ◽  
Shaohua Chen ◽  
Siyu Wang ◽  
Haiqing Liao ◽  
Xuejiao Deng
Keyword(s):  
Spatial Distribution ◽  
Sulfur Compounds ◽  
Organic Sulfur ◽  
Industrial Emissions ◽  
Diethyl Sulfide ◽  
Organic Sulfur Compounds ◽  
Factors Influencing ◽  
Pollution Status ◽  
Volatile Organic ◽  
Volatile Organic Sulfur Compounds

Abstract This study investigated the pollution status of volatile organic sulfur compounds (VOSCs) and the factors influencing their spatial distribution in the Xi River in Shenyang, China. A method for simultaneous determination of 14 VOSCs that cause odor in water samples was developed by using purge and trap coupled with gas chromatography and a flame photometric detector. The results indicated that each target compound could be identified from 15 sampling sites, and the total concentration of 14 VOSCs ranged from 2.575 to 52.981 μg L−1. Dimethyl sulfide (DMS) was the most important contaminant with an average concentration of 4.029 μg L−1, a detection rate of 93.33% and a variation coefficient of 0.72. The VOSCs were primarily distributed in suburban and rural sections, and the suburban section was the worst in regard to pollution by VOSCs. Dimethyl trisulfide was primarily distributed in urban and suburban sections of the Xi River due to industrial emissions. Ethanethiol, DMS, and ethyl methyl sulfide, which are typical by-products of microbial anaerobic decomposition from domestic wastewater, were found in abundance in the suburban section. Diethyl sulfide, diethyl disulfide, methyl propyl disulfide, and 1-propyl disulfide representing agricultural nonpoint source pollution were mostly distributed in the rural section.

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