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4,970 Newest Publications about the topic sulfur

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ChemInform Abstract: A One‐Pot, Multi‐Component Reaction for the Synthesis of Fully Substituted 5‐Amino‐4‐carboxamide‐thiazoles.

01-Aug-2013 | Kaleen K. Childers, Andrew M. Haidle, Michelle R. Machacek, J. Patrick Rogers, Eric Romeo, ChemInform, 2013

Abstract Various target compounds, intermediates in the preparation of pharmacologically active substances, are directly obtained by base‐promoted condensation of 2‐amido‐2‐cyanoacetamide (I) with a variety of aldehydes in the presence of elemental sulfur.

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ChemInform Abstract: The Direct Thiolation of Benzothiazole Catalyzed by Copper Complex in Superbase System.

01-Aug-2013 | Xiaowei Wang, Yanjun Li, Yu Yuan, ChemInform, 2013

Abstract The process involves in situ formation of disulfides from aryl iodides and sulfur under superbase conditions.

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[Molecular Pathology] The Role of Mitochondria in Cellular Iron-Sulfur Protein Biogenesis: Mechanisms, Connected Processes, and Diseases

01-Aug-2013 | Oliver Stehling; Roland Lill, CSH Perspectives, 2013

Iron–sulfur (Fe/S) clusters belong to the most ancient protein cofactors in life, and fulfill functions in electron transport, enzyme catalysis, homeostatic regulation, and sulfur activation. The synthesis of Fe/S clusters and their insertion into apoproteins requires almost 30 proteins in the ...

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A Radical Cascade Cyclization To Prepare Dihydrothiophenes Induced by Thiyl Radicals as Sulfur Biradical Equivalents

01-Aug-2013 | Akio Kamimura; Koichiro Miyazaki; Yu Yamane; Ryuichiro Yo; Shingo Ishikawa; Hidemitsu Uno; Michinori Sumimoto, The Journal of Organic Chemistry, 2013

Bicyclic dihydrothiophenes are readily prepared by a radical cascade cyclization reaction triggered by the addition of a thiyl radical under thermal or photoirradiation conditions. The translocated radical attacks the sulfur atom in the initial radical donor unit in an SHi manner. Sufficient ...

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Distribution of Saturates, Aromatics, Resins, and Asphaltenes Fractions in the Bituminous Layer of Athabasca Oil Sands

01-Aug-2013 | Lin He; Xingang Li; Guozhong Wu; Feng Lin; Hong Sui, Energy & Fuels, 2013

The composition and distribution of saturates, aromatics, resins, and asphaltenes (SARA) fractions in the bituminous layer on the surface of Athabasca oil sands were identified using elemental analysis (EA), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (SEM) ...

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Exciton Description of Chlorosome to Baseplate Excitation Energy Transfer in Filamentous Anoxygenic Phototrophs and Green Sulfur Bacteria

01-Aug-2013 | Juha M. Linnanto; Jouko E. I. Korppi-Tommola, Journal of Physical Chemistry B, 2013

A description of intra-chlorosome and from chlorosome to baseplate excitation energy transfer in green sulfur bacteria and in filamentous anoxygenic phototrophs is presented. Various shapes and sizes, single and multiwalled tubes, cylindrical spirals and lamellae of the antenna elements mimicking ...

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On the Importance of Anion–π Interactions in the Mechanism of Sulfide:Quinone Oxidoreductase

31-Jul-2013 | Antonio Bauzá, David Quiñonero, Pere M. Deyà, Antonio Frontera, Chemistry - An Asian Journal, 2013

Abstract Sulfide:quinone oxidoreductase (SQR) is a flavin‐dependent enzyme that plays a physiological role in two important processes. First, it is responsible for sulfide detoxification by oxidizing sulfide ions (S2− and HS−) to elementary sulfur and the electrons are first transferred to ...

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Reaction of Silylene with Sulfur Dioxide: Some Gas-Phase Kinetic and Theoretical Studies

31-Jul-2013 | Rosa Becerra; John Patrick Cannady; Nicola Goldberg; Robin Walsh, Physical Chemistry Chemical Physics, 2013

Time-resolved kinetic studies of the reaction of silylene, SiH2, with SO2 have been carried out in the gas phase over the temperature range 297-609 K, using laser flash photolysis to generate and monitor SiH2. The second order rate coefficients at 1.3 kPa (SF6 bath gas) fitted the Arrhenius ...

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Ash-Forming Matter in Torrefied Birch Wood: Changes in Chemical Association

31-Jul-2013 | Tooran Khazraie Shoulaifar; Nikolai DeMartini; Maria Zevenhoven; Fred Verhoeff; Jaap Kiel; Mikko Hupa, Energy & Fuels, 2013

Torrefaction is heat treatment of biomass at relatively low temperatures (∼240–300 °C) in the absence of air. The torrefied fuel offers advantages to traditional biomass, such as higher energy density, better grindability, and reduced biological decay. These factors could, for example, lead to ...

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Practical and Highly Selective Sulfur Ylide-Mediated Asymmetric Epoxidations and Aziridinations Using a Cheap and Readily Available Chiral Sulfide: Extensive Studies To Map Out Scope, Limitations, and Rationalization of Diastereo- and Enantioselectivities

31-Jul-2013 | Ona Illa; Mariam Namutebi; Chandreyee Saha; Mehrnoosh Ostovar; C. Chun Chen; Mairi F. Haddow; Sophie Nocquet-Thibaul ..., Journal of the American Chemical Society, 2013

The chiral sulfide, isothiocineole, has been synthesized in one step from elemental sulfur, γ-terpinene, and limonene in 61% yield. A mechanism involving radical intermediates for this reaction is proposed based on experimental evidence. The application of isothiocineole to the asymmetric ...

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