The Experts below are selected from a list of 19983 Experts worldwide ranked by ideXlab platform
Thanh Binh Nguyen - One of the best experts on this subject based on the ideXlab platform.
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Elemental Sulfur and molecular iodine as efficient tools for carbon nitrogen bond formation through redox reactions
Asian Journal of Organic Chemistry, 2017Co-Authors: Thanh Binh NguyenAbstract:Carbon-nitrogen bonds are ubiquitous in organic chemistry. This review focuses on the formation of these important linkages and describes some recent advances in redox reactions that involve Elemental Sulfur and molecular iodine as excellent reagents and catalysts.
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recent advances in organic reactions involving Elemental Sulfur
Advanced Synthesis & Catalysis, 2017Co-Authors: Thanh Binh NguyenAbstract:Elemental Sulfur has been known since Antiquity and found widespread applications in the preparation of black gunpowder, the synthesis of Sulfuric acid as well as other Sulfur-containing compounds, and the vulcanization of rubber. Over the last several years, we have come to better understand its properties and discover more applications of Elemental Sulfur in synthetic organic chemistry. This review summarizes the advances from 2000 in the construction of organic molecules using Elemental Sulfur via Sulfuration, oxidation, reduction and redox condensation processes.
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concise access to 2 aroylbenzothiazoles by redox condensation reaction between o halonitrobenzenes acetophenones and Elemental Sulfur
Organic Letters, 2015Co-Authors: Thanh Binh Nguyen, Ludmila Ermolenko, Karine Pasturaud, Ali AlmourabitAbstract:A wide range of 2-aroylbenzothiazoles 3 including some pharmacologically relevant derivatives can be obtained in high yields by simply heating o-halonitrobenzenes 1, acetophenones 2, Elemental Sulfur, and N-methylmorpholine. This three-component nitro methyl coupling was found to occur in an excellent atom-, step-, and redox-efficient manner in which Elemental Sulfur played the role of nucleophile building block and redox moderating agent to fulfill electronic requirements of the global reaction.
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three component reaction between alkynes Elemental Sulfur and aliphatic amines a general straightforward and atom economical approach to thioamides
Organic Letters, 2014Co-Authors: Thanh Binh Nguyen, Ludmila Ermolenko, Minh Tran, Ali AlmourabitAbstract:A general, straightforward, and atom-economical three-component synthesis of thioamides from alkynes, Elemental Sulfur, and aliphatic amines has been developed.
Richard C D Brown - One of the best experts on this subject based on the ideXlab platform.
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quantitative uhpsfc ms analysis of Elemental Sulfur in mineral oil via derivatisation with triphenylphosphine application to corrosive Sulfur related power transformer failure
Analyst, 2020Co-Authors: Sergio Garcia, Julie Herniman, Peter R Birkin, J A Pilgrim, P L Lewin, Gordon Wilson, John G Langley, Richard C D BrownAbstract:An ultrahigh-performance supercritical fluid chromatography–mass spectrometry (UHPSFC-MS) method has been developed as a rapid and reliable analytical method for the detection and quantification of Elemental Sulfur in mineral transformer oil. The method described in this paper is based on the selective reaction of Elemental Sulfur with triphenylphosphine (TPP). The derivatisation of Elemental Sulfur requires minimal sample preparation and resulted in the formation of a single compound, namely triphenylphosphine sulfide (TPPS). This derivative is quantified from the complex oil composition using electrospray ionisation-mass spectrometry (ESI-MS) in selected ion monitoring (SIM) mode, and the reported UHPSFC-MS method allows detection and quantification of the derivative at ppb levels. As Sulfur contamination in mineral transformer oil has been linked to costly failures of oil/paper-based power transformers due to corrosion, the analytical approach is demonstrated through its application to mineral oil samples from in service and decommisioned power transformers. The method is ideal as a routine test or to confirm the presence of Elemental Sulfur in samples where corrosion has occurred.
Ludmila Ermolenko - One of the best experts on this subject based on the ideXlab platform.
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concise access to 2 aroylbenzothiazoles by redox condensation reaction between o halonitrobenzenes acetophenones and Elemental Sulfur
Organic Letters, 2015Co-Authors: Thanh Binh Nguyen, Ludmila Ermolenko, Karine Pasturaud, Ali AlmourabitAbstract:A wide range of 2-aroylbenzothiazoles 3 including some pharmacologically relevant derivatives can be obtained in high yields by simply heating o-halonitrobenzenes 1, acetophenones 2, Elemental Sulfur, and N-methylmorpholine. This three-component nitro methyl coupling was found to occur in an excellent atom-, step-, and redox-efficient manner in which Elemental Sulfur played the role of nucleophile building block and redox moderating agent to fulfill electronic requirements of the global reaction.
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Elemental Sulfur disproportionation in the redox condensation reaction between o-halonitrobenzenes and benzylamines.
Angewandte Chemie International Edition, 2014Co-Authors: T .b. Nguyen, Ludmila Ermolenko, Pascal Retailleau, Ali Al-mourabitAbstract:The disproportionation of Elemental Sulfur at moderate temperatures is investigated in the redox condensation involving o-halonitrobenzenes 1 and benzylamines 2. As a redox moderator, Elemental Sulfur plays the dual role of both electron donor and acceptor, generating its lowest and highest oxidation states: S(-2) (sulfide equivalent) in benzothiazole 3 and S(+6) (sulfate equivalent) in sulfamate 4, and filling the electron gap of the global redox condensation process. Along with this process, a cascade of reactions of reduction of the nitro group of 1, oxidation of the aminomethyl group of 2, metal-free aromatic halogen substitution, and condensation finally led to 2-arylbenzothiazoles 3.
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three component reaction between alkynes Elemental Sulfur and aliphatic amines a general straightforward and atom economical approach to thioamides
Organic Letters, 2014Co-Authors: Thanh Binh Nguyen, Ludmila Ermolenko, Minh Tran, Ali AlmourabitAbstract:A general, straightforward, and atom-economical three-component synthesis of thioamides from alkynes, Elemental Sulfur, and aliphatic amines has been developed.
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Efficient and selective multicomponent oxidative coupling of two different aliphatic primary amines into thioamides by Elemental Sulfur
Organic Letters, 2012Co-Authors: T. Nguyen, Ludmila Ermolenko, Ali Al-mourabitAbstract:An efficient and selective multicomponent oxidative coupling of two different aliphatic primary amines into thioamides by Elemental Sulfur under solvent-free conditions has been developed.
Ali Al-mourabit - One of the best experts on this subject based on the ideXlab platform.
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Elemental Sulfur disproportionation in the redox condensation reaction between o-halonitrobenzenes and benzylamines.
Angewandte Chemie International Edition, 2014Co-Authors: T .b. Nguyen, Ludmila Ermolenko, Pascal Retailleau, Ali Al-mourabitAbstract:The disproportionation of Elemental Sulfur at moderate temperatures is investigated in the redox condensation involving o-halonitrobenzenes 1 and benzylamines 2. As a redox moderator, Elemental Sulfur plays the dual role of both electron donor and acceptor, generating its lowest and highest oxidation states: S(-2) (sulfide equivalent) in benzothiazole 3 and S(+6) (sulfate equivalent) in sulfamate 4, and filling the electron gap of the global redox condensation process. Along with this process, a cascade of reactions of reduction of the nitro group of 1, oxidation of the aminomethyl group of 2, metal-free aromatic halogen substitution, and condensation finally led to 2-arylbenzothiazoles 3.
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Efficient and selective multicomponent oxidative coupling of two different aliphatic primary amines into thioamides by Elemental Sulfur
Organic Letters, 2012Co-Authors: T. Nguyen, Ludmila Ermolenko, Ali Al-mourabitAbstract:An efficient and selective multicomponent oxidative coupling of two different aliphatic primary amines into thioamides by Elemental Sulfur under solvent-free conditions has been developed.
Sergio Garcia - One of the best experts on this subject based on the ideXlab platform.
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quantitative uhpsfc ms analysis of Elemental Sulfur in mineral oil via derivatisation with triphenylphosphine application to corrosive Sulfur related power transformer failure
Analyst, 2020Co-Authors: Sergio Garcia, Julie Herniman, Peter R Birkin, J A Pilgrim, P L Lewin, Gordon Wilson, John G Langley, Richard C D BrownAbstract:An ultrahigh-performance supercritical fluid chromatography–mass spectrometry (UHPSFC-MS) method has been developed as a rapid and reliable analytical method for the detection and quantification of Elemental Sulfur in mineral transformer oil. The method described in this paper is based on the selective reaction of Elemental Sulfur with triphenylphosphine (TPP). The derivatisation of Elemental Sulfur requires minimal sample preparation and resulted in the formation of a single compound, namely triphenylphosphine sulfide (TPPS). This derivative is quantified from the complex oil composition using electrospray ionisation-mass spectrometry (ESI-MS) in selected ion monitoring (SIM) mode, and the reported UHPSFC-MS method allows detection and quantification of the derivative at ppb levels. As Sulfur contamination in mineral transformer oil has been linked to costly failures of oil/paper-based power transformers due to corrosion, the analytical approach is demonstrated through its application to mineral oil samples from in service and decommisioned power transformers. The method is ideal as a routine test or to confirm the presence of Elemental Sulfur in samples where corrosion has occurred.