The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Masahiko Yamaguchi - One of the best experts on this subject based on the ideXlab platform.
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Rhodium-Catalyzed Synthesis of Organosulfur Compounds Involving S-S Bond Cleavage of Disulfides and Sulfur.
Molecules (Basel Switzerland), 2020Co-Authors: Mieko Arisawa, Masahiko YamaguchiAbstract:Organosulfur Compounds are widely used for the manufacture of drugs and materials, and their synthesis in general conventionally employs nucleophilic substitution reactions of thiolate anions formed from thiols and bases. To synthesize advanced functional Organosulfur Compounds, development of novel synthetic methods is an important task. We have been studying the synthesis of Organosulfur Compounds by transition-metal catalysis using disulfides and sulfur, which are easier to handle and less odiferous than thiols. In this article, we describe our development that rhodium complexes efficiently catalyze the cleavage of S-S bonds and transfer organothio groups to organic Compounds, which provide diverse Organosulfur Compounds. The synthesis does not require use of bases or organometallic reagents; furthermore, it is reversible, involving chemical equilibria and interconversion reactions.
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Rhodium-Catalyzed Synthesis of Organosulfur Compounds using Sulfur
Synlett, 2019Co-Authors: Mieko Arisawa, Masahiko YamaguchiAbstract:Sulfur is one of the few elements that occurs uncombined in nature. Sulfur atoms are found in natural amino acids and vitamins. In the chemical industry, Organosulfur Compounds are used for fabricating rubber, fibers, and dyes, pharmaceuticals, and pesticides. Although sulfur, which is cheap and easy to handle, is a useful source of sulfur atom in functional Organosulfur Compounds, it is rarely used in organic synthesis. Activation of sulfur by high temperature, light irradiation, treatment with nucleophiles and electrophiles, and redox conditions often results in the formation of various active sulfur species, which complicate reactions. The development of a method that mildly activates sulfur is therefore desired. The use of transition-metal catalysts is a new method of activating sulfur under mild conditions, and, in this article, we describe the rhodium-catalyzed synthesis of various Organosulfur Compounds by the insertion of sulfur atoms into single bonds and by the addition of sulfur to unsaturated bond in various organic Compounds. 1 Introduction 2 Sulfur Activation without using Transition Metal 3 Transition-Metal-Catalyzed Activation of Sulfur 4 Rhodium-Catalyzed Reactions using Sulfur 4.1 Rhodium-Catalyzed Sulfur Atom Exchange Reactions using Sulfur 4.2 Synthesis of Diaryl Sulfides using Rhodium-Catalyzed Exchange Reaction of Aryl Fluorides and Sulfur/Organopolysulfides 4.3 Rhodium-Catalyzed Synthesis of Isothiocyanate using Sulfur 4.4 Rhodium-Catalyzed Sulfur Addition Reaction to Alkenes for Thiiranes Synthesis 4.5 Rhodium-Catalyzed Sulfur Addition Reaction to Alkynes for 1,4-Dithiins Synthesis 5 Conclusion
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Rhodium-Catalyzed Synthesis of Organosulfur Compounds using Sulfur
Synlett, 2019Co-Authors: Mieko Arisawa, Masahiko YamaguchiAbstract:Sulfur is one of the few elements that occurs uncombined in nature. Sulfur atoms are found in natural amino acids and vitamins. In the chemical industry, Organosulfur Compounds are used for fabricating rubber, fibers, and dyes, pharmaceuticals, and pesticides. Although sulfur, which is cheap and easy to handle, is a useful source of sulfur atom in functional Organosulfur Compounds, it is rarely used in organic synthesis. Activation of sulfur by high temperature, light irradiation, treatment with nucleophiles and electrophiles, and redox conditions often results in the formation of various active sulfur species, which complicate reactions. The development of a method that mildly activates sulfur is therefore desired. The use of transition-metal catalysts is a new method of activating sulfur under mild conditions, and, in this article, we describe the rhodium-catalyzed synthesis of various Organosulfur Compounds by the insertion of sulfur atoms into single bonds and by the addition of sulfur to unsaturated bond in various organic Compounds. 1 Introduction 2 Sulfur Activation without using Transition Metal 3 Transition-Metal-Catalyzed Activation of Sulfur 4 Rhodium-Catalyzed Reactions using Sulfur 4.1 Rhodium-Catalyzed Sulfur Atom Exchange Reactions using Sulfur 4.2 Synthesis of Diaryl Sulfides using Rhodium-Catalyzed Exchange Reaction of Aryl Fluorides and Sulfur/Organopolysulfides 4.3 Rhodium-Catalyzed Synthesis of Isothiocyanate using Sulfur 4.4 Rhodium-Catalyzed Sulfur Addition Reaction to Alkenes for Thiiranes Synthesis 4.5 Rhodium-Catalyzed Sulfur Addition Reaction to Alkynes for 1,4-Dithiins Synthesis 5 Conclusion
Mieko Arisawa - One of the best experts on this subject based on the ideXlab platform.
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Rhodium-Catalyzed Synthesis of Organosulfur Compounds Involving S-S Bond Cleavage of Disulfides and Sulfur.
Molecules (Basel Switzerland), 2020Co-Authors: Mieko Arisawa, Masahiko YamaguchiAbstract:Organosulfur Compounds are widely used for the manufacture of drugs and materials, and their synthesis in general conventionally employs nucleophilic substitution reactions of thiolate anions formed from thiols and bases. To synthesize advanced functional Organosulfur Compounds, development of novel synthetic methods is an important task. We have been studying the synthesis of Organosulfur Compounds by transition-metal catalysis using disulfides and sulfur, which are easier to handle and less odiferous than thiols. In this article, we describe our development that rhodium complexes efficiently catalyze the cleavage of S-S bonds and transfer organothio groups to organic Compounds, which provide diverse Organosulfur Compounds. The synthesis does not require use of bases or organometallic reagents; furthermore, it is reversible, involving chemical equilibria and interconversion reactions.
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Rhodium-Catalyzed Synthesis of Organosulfur Compounds using Sulfur
Synlett, 2019Co-Authors: Mieko Arisawa, Masahiko YamaguchiAbstract:Sulfur is one of the few elements that occurs uncombined in nature. Sulfur atoms are found in natural amino acids and vitamins. In the chemical industry, Organosulfur Compounds are used for fabricating rubber, fibers, and dyes, pharmaceuticals, and pesticides. Although sulfur, which is cheap and easy to handle, is a useful source of sulfur atom in functional Organosulfur Compounds, it is rarely used in organic synthesis. Activation of sulfur by high temperature, light irradiation, treatment with nucleophiles and electrophiles, and redox conditions often results in the formation of various active sulfur species, which complicate reactions. The development of a method that mildly activates sulfur is therefore desired. The use of transition-metal catalysts is a new method of activating sulfur under mild conditions, and, in this article, we describe the rhodium-catalyzed synthesis of various Organosulfur Compounds by the insertion of sulfur atoms into single bonds and by the addition of sulfur to unsaturated bond in various organic Compounds. 1 Introduction 2 Sulfur Activation without using Transition Metal 3 Transition-Metal-Catalyzed Activation of Sulfur 4 Rhodium-Catalyzed Reactions using Sulfur 4.1 Rhodium-Catalyzed Sulfur Atom Exchange Reactions using Sulfur 4.2 Synthesis of Diaryl Sulfides using Rhodium-Catalyzed Exchange Reaction of Aryl Fluorides and Sulfur/Organopolysulfides 4.3 Rhodium-Catalyzed Synthesis of Isothiocyanate using Sulfur 4.4 Rhodium-Catalyzed Sulfur Addition Reaction to Alkenes for Thiiranes Synthesis 4.5 Rhodium-Catalyzed Sulfur Addition Reaction to Alkynes for 1,4-Dithiins Synthesis 5 Conclusion
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Rhodium-Catalyzed Synthesis of Organosulfur Compounds using Sulfur
Synlett, 2019Co-Authors: Mieko Arisawa, Masahiko YamaguchiAbstract:Sulfur is one of the few elements that occurs uncombined in nature. Sulfur atoms are found in natural amino acids and vitamins. In the chemical industry, Organosulfur Compounds are used for fabricating rubber, fibers, and dyes, pharmaceuticals, and pesticides. Although sulfur, which is cheap and easy to handle, is a useful source of sulfur atom in functional Organosulfur Compounds, it is rarely used in organic synthesis. Activation of sulfur by high temperature, light irradiation, treatment with nucleophiles and electrophiles, and redox conditions often results in the formation of various active sulfur species, which complicate reactions. The development of a method that mildly activates sulfur is therefore desired. The use of transition-metal catalysts is a new method of activating sulfur under mild conditions, and, in this article, we describe the rhodium-catalyzed synthesis of various Organosulfur Compounds by the insertion of sulfur atoms into single bonds and by the addition of sulfur to unsaturated bond in various organic Compounds. 1 Introduction 2 Sulfur Activation without using Transition Metal 3 Transition-Metal-Catalyzed Activation of Sulfur 4 Rhodium-Catalyzed Reactions using Sulfur 4.1 Rhodium-Catalyzed Sulfur Atom Exchange Reactions using Sulfur 4.2 Synthesis of Diaryl Sulfides using Rhodium-Catalyzed Exchange Reaction of Aryl Fluorides and Sulfur/Organopolysulfides 4.3 Rhodium-Catalyzed Synthesis of Isothiocyanate using Sulfur 4.4 Rhodium-Catalyzed Sulfur Addition Reaction to Alkenes for Thiiranes Synthesis 4.5 Rhodium-Catalyzed Sulfur Addition Reaction to Alkynes for 1,4-Dithiins Synthesis 5 Conclusion
Hui-ming Cheng - One of the best experts on this subject based on the ideXlab platform.
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Structure-related electrochemical performance of Organosulfur Compounds for lithium–sulfur batteries
Energy & Environmental Science, 2020Co-Authors: Xiaoyin Zhang, Ke Chen, Zhenhua Sun, Ru Xiao, Hui-ming ChengAbstract:Lithium–sulfur batteries (Li–S batteries) are promising next-generation energy storage devices due to their high theoretical energy density, low cost, and environmental compatibility. When trying to convert experiment into practice, one finds that sulfur cathodes, especially a cyclic octasulfur cathode, and lithium metal anodes present several problems, including sulfur shuttling, the fact that S is an insulator, complex 16-electron reactions, and the formation of lithium dendrites. In recent years, Organosulfur Compounds have been extensively investigated for Li–S batteries in order to solve these problems and understand the electrochemical process during their redox reactions. This review aims to summarize the different functions of Organosulfur Compounds, and figure out a guideline for understanding and using them in Li–S batteries. The Organosulfur Compounds currently used as active materials are classified into three types based on their electrochemical behavior, and design principles of the molecular and polymer structures of Organosulfur Compounds are concluded. Based on these design principles, we summarize how to control their electrochemical performance, and suggest possible electrochemical mechanisms and other characteristics. Finally, we propose guidelines for the development of promising Organosulfur Compounds using emerging technologies, including advanced characterization techniques, innovative methods of synthesis of such Compounds, and machine-learning techniques.
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structure related electrochemical performance of Organosulfur Compounds for lithium sulfur batteries
Energy and Environmental Science, 2020Co-Authors: Xiaoyin Zhang, Ke Chen, Zhenhua Sun, Ru Xiao, Hui-ming ChengAbstract:Lithium–sulfur batteries (Li–S batteries) are promising next-generation energy storage devices due to their high theoretical energy density, low cost, and environmental compatibility. When trying to convert experiment into practice, one finds that sulfur cathodes, especially a cyclic octasulfur cathode, and lithium metal anodes present several problems, including sulfur shuttling, the fact that S is an insulator, complex 16-electron reactions, and the formation of lithium dendrites. In recent years, Organosulfur Compounds have been extensively investigated for Li–S batteries in order to solve these problems and understand the electrochemical process during their redox reactions. This review aims to summarize the different functions of Organosulfur Compounds, and figure out a guideline for understanding and using them in Li–S batteries. The Organosulfur Compounds currently used as active materials are classified into three types based on their electrochemical behavior, and design principles of the molecular and polymer structures of Organosulfur Compounds are concluded. Based on these design principles, we summarize how to control their electrochemical performance, and suggest possible electrochemical mechanisms and other characteristics. Finally, we propose guidelines for the development of promising Organosulfur Compounds using emerging technologies, including advanced characterization techniques, innovative methods of synthesis of such Compounds, and machine-learning techniques.
Xiaoyin Zhang - One of the best experts on this subject based on the ideXlab platform.
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Structure-related electrochemical performance of Organosulfur Compounds for lithium–sulfur batteries
Energy & Environmental Science, 2020Co-Authors: Xiaoyin Zhang, Ke Chen, Zhenhua Sun, Ru Xiao, Hui-ming ChengAbstract:Lithium–sulfur batteries (Li–S batteries) are promising next-generation energy storage devices due to their high theoretical energy density, low cost, and environmental compatibility. When trying to convert experiment into practice, one finds that sulfur cathodes, especially a cyclic octasulfur cathode, and lithium metal anodes present several problems, including sulfur shuttling, the fact that S is an insulator, complex 16-electron reactions, and the formation of lithium dendrites. In recent years, Organosulfur Compounds have been extensively investigated for Li–S batteries in order to solve these problems and understand the electrochemical process during their redox reactions. This review aims to summarize the different functions of Organosulfur Compounds, and figure out a guideline for understanding and using them in Li–S batteries. The Organosulfur Compounds currently used as active materials are classified into three types based on their electrochemical behavior, and design principles of the molecular and polymer structures of Organosulfur Compounds are concluded. Based on these design principles, we summarize how to control their electrochemical performance, and suggest possible electrochemical mechanisms and other characteristics. Finally, we propose guidelines for the development of promising Organosulfur Compounds using emerging technologies, including advanced characterization techniques, innovative methods of synthesis of such Compounds, and machine-learning techniques.
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structure related electrochemical performance of Organosulfur Compounds for lithium sulfur batteries
Energy and Environmental Science, 2020Co-Authors: Xiaoyin Zhang, Ke Chen, Zhenhua Sun, Ru Xiao, Hui-ming ChengAbstract:Lithium–sulfur batteries (Li–S batteries) are promising next-generation energy storage devices due to their high theoretical energy density, low cost, and environmental compatibility. When trying to convert experiment into practice, one finds that sulfur cathodes, especially a cyclic octasulfur cathode, and lithium metal anodes present several problems, including sulfur shuttling, the fact that S is an insulator, complex 16-electron reactions, and the formation of lithium dendrites. In recent years, Organosulfur Compounds have been extensively investigated for Li–S batteries in order to solve these problems and understand the electrochemical process during their redox reactions. This review aims to summarize the different functions of Organosulfur Compounds, and figure out a guideline for understanding and using them in Li–S batteries. The Organosulfur Compounds currently used as active materials are classified into three types based on their electrochemical behavior, and design principles of the molecular and polymer structures of Organosulfur Compounds are concluded. Based on these design principles, we summarize how to control their electrochemical performance, and suggest possible electrochemical mechanisms and other characteristics. Finally, we propose guidelines for the development of promising Organosulfur Compounds using emerging technologies, including advanced characterization techniques, innovative methods of synthesis of such Compounds, and machine-learning techniques.
Yungui Peng - One of the best experts on this subject based on the ideXlab platform.
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asymmetric multicomponent sulfa michael mannich cascade reaction synthetic access to 1 2 diamino 3 Organosulfur Compounds and 2 nitro allylic amines
ChemInform, 2016Co-Authors: Wenduan Hou, Jing Chen, Qi Wei, Guisheng Liu, Jing Guo, Yungui PengAbstract:A novel catalytic asymmetric three-component intermolecular sulfa-Michael/Mannich cascade reaction has been developed using a chiral multifunctional catalyst. This reaction provides facile access to 1-amino-2-nitro-3-Organosulfur Compounds bearing three consecutive stereocenters in high yields (up to 96%) with good diastereo- (up to 91:4:4:1 dr) and excellent enantioselectivities (93–99% ee). Furthermore, the products of this reaction could be facilely transformed into potentially bioactive 1, 2-diamino-3-Organosulfur Compounds and 2-nitro allylic amines.
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Asymmetric Multicomponent Sulfa-Michael/Mannich Cascade Reaction: Synthetic Access to 1,2-Diamino-3-Organosulfur Compounds and 2-Nitro Allylic Amines.
Organic Letters, 2015Co-Authors: Jing Chen, Yungui PengAbstract:A novel catalytic asymmetric three-component intermolecular sulfa-Michael/Mannich cascade reaction has been developed using a chiral multifunctional catalyst. This reaction provides facile access to 1-amino-2-nitro-3-Organosulfur Compounds bearing three consecutive stereocenters in high yields (up to 96%) with good diastereo- (up to 91:4:4:1 dr) and excellent enantioselectivities (93–99% ee). Furthermore, the products of this reaction could be facilely transformed into potentially bioactive 1, 2-diamino-3-Organosulfur Compounds and 2-nitro allylic amines.