The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Jennifer L. Roizen - One of the best experts on this subject based on the ideXlab platform.
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Synthesis of N-Substituted Sulfamate Esters from Sulfamic Acid Salts by Activation with Triphenylphosphine Ditriflate.
Organic Letters, 2017Co-Authors: J. Miles Blackburn, Melanie A. Short, Thomas Castanheiro, Suraj K. Ayer, Tobias D. Muellers, Jennifer L. RoizenAbstract:A general approach to access sulfamate esters through preparation of Sulfamic Acid salts, subsequent activation with triphenylphosphine ditriflate, and nucleophilic trapping is disclosed. The method proceeds in modest to excellent yields to incorporate nucleophiles derived from aliphatic alcohols and phenols. This approach can be employed to furnish differentially substituted sulfamides.
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Synthesis of N‑Substituted Sulfamate Esters from Sulfamic Acid Salts by Activation with Triphenylphosphine Ditriflate
2017Co-Authors: Miles J. Blackburn, Melanie A. Short, Thomas Castanheiro, Suraj K. Ayer, Tobias D. Muellers, Jennifer L. RoizenAbstract:A general approach to access sulfamate esters through preparation of Sulfamic Acid salts, subsequent activation with triphenylphosphine ditriflate, and nucleophilic trapping is disclosed. The method proceeds in modest to excellent yields to incorporate nucleophiles derived from aliphatic alcohols and phenols. This approach can be employed to furnish differentially substituted sulfamides
Majid M. Heravi - One of the best experts on this subject based on the ideXlab platform.
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Sulfamic Acid catalyzed three component one pot synthesis of 1 2 4 triazolo benzimidazolo quinazolinone derivatives
ChemInform, 2010Co-Authors: Majid M. Heravi, Fatemeh Derikvand, Leila RanjbarAbstract:Quinazolinone derivatives of type (IV) or (VI) are prepared in a three-component one-pot synthesis using Sulfamic Acid as catalyst.
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Sulfamic Acid catalyzed three component one pot synthesis of 1 2 4 triazolo benzimidazolo quinazolinone derivatives
Synthetic Communications, 2010Co-Authors: Majid M. Heravi, Fatemeh Derikvand, Leila RanjbarAbstract:An efficient and convenient approach is reported for three-component, one-pot synthesis of the [1,2,4]triazolo/benzimidazolo quinazolinones by condensation of 2-amino benzimidazole or 3-amino-1,2,4-triazole as amine sources with dimedone and different aldehydes in the presence of Sulfamic Acid as a reusable, green catalyst in acetonitrile and under heating conditions.
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three component one pot synthesis of 4 6 diarylpyrimidin 2 1h ones under solvent free conditions in the presence of Sulfamic Acid as a green and reusable catalyst
Molecular Diversity, 2008Co-Authors: Majid M. Heravi, Leila Ranjbar, Fatemeh Derikvand, Behnoush AlimadadiAbstract:A rapid and efficient one-pot method for the synthesis of 4,6-diarylpyrimidin-2(1H)-ones and related heterocycles is described. The condensation of acetophenone derivatives, aldehydes and urea in the presence of Sulfamic Acid was employed to synthesize a variety of pyrimidinones in moderate to excellent yields. The scope and limitations of this method are described.
Leila Ranjbar - One of the best experts on this subject based on the ideXlab platform.
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Sulfamic Acid catalyzed three component one pot synthesis of 1 2 4 triazolo benzimidazolo quinazolinone derivatives
ChemInform, 2010Co-Authors: Majid M. Heravi, Fatemeh Derikvand, Leila RanjbarAbstract:Quinazolinone derivatives of type (IV) or (VI) are prepared in a three-component one-pot synthesis using Sulfamic Acid as catalyst.
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Sulfamic Acid catalyzed three component one pot synthesis of 1 2 4 triazolo benzimidazolo quinazolinone derivatives
Synthetic Communications, 2010Co-Authors: Majid M. Heravi, Fatemeh Derikvand, Leila RanjbarAbstract:An efficient and convenient approach is reported for three-component, one-pot synthesis of the [1,2,4]triazolo/benzimidazolo quinazolinones by condensation of 2-amino benzimidazole or 3-amino-1,2,4-triazole as amine sources with dimedone and different aldehydes in the presence of Sulfamic Acid as a reusable, green catalyst in acetonitrile and under heating conditions.
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three component one pot synthesis of 4 6 diarylpyrimidin 2 1h ones under solvent free conditions in the presence of Sulfamic Acid as a green and reusable catalyst
Molecular Diversity, 2008Co-Authors: Majid M. Heravi, Leila Ranjbar, Fatemeh Derikvand, Behnoush AlimadadiAbstract:A rapid and efficient one-pot method for the synthesis of 4,6-diarylpyrimidin-2(1H)-ones and related heterocycles is described. The condensation of acetophenone derivatives, aldehydes and urea in the presence of Sulfamic Acid was employed to synthesize a variety of pyrimidinones in moderate to excellent yields. The scope and limitations of this method are described.
Hyungshik Shin - One of the best experts on this subject based on the ideXlab platform.
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Sulfamic Acid doped polyaniline nanofibers thin film based counter electrode application in dye sensitized solar cells
Journal of Physical Chemistry C, 2010Co-Authors: Sadia Ameen, Shaheer M Akhtar, Young Soon Kim, Obong Yang, Hyungshik ShinAbstract:Uniform polyaniline nanofibers (PANI NFs) and chemically doped Sulfamic Acid (SFA) PANI NFs, synthesized via template free interfacial polymerization process, were used as new counter electrodes ma...
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Sulfamic Acid doped polyaniline nanofibers thin film based counter electrode application in dye sensitized solar cells
Journal of Physical Chemistry C, 2010Co-Authors: Sadia Ameen, Shaheer M Akhtar, Obong Yang, Hyungshik ShinAbstract:Uniform polyaniline nanofibers (PANI NFs) and chemically doped Sulfamic Acid (SFA) PANI NFs, synthesized via template free interfacial polymerization process, were used as new counter electrodes materials for the fabrication of the highly efficient dye-sensitized solar cells (DSSCs). The PANI NFs-based fabricated DSSCs exhibited a solar-to-electricity conversion efficiency of ∼4.0%, while the SFA-doped PANI NFs-based DSSC demonstrated ∼27% improvement in the solar-to-electricity conversion efficiency. The obtained solar-to-electricity conversion efficiency for SFA-doped PANI NFs-based DSSC was 5.5% under 100 mW/cm2 (AM1.5). The enhancement in the conversion efficiency was due to the incorporation of SFA into the PANI NFs, which resulted in the higher electrocatalytic activity for the I3−/I− redox reaction.
Sadia Ameen - One of the best experts on this subject based on the ideXlab platform.
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Sulfamic Acid doped polyaniline nanofibers thin film based counter electrode application in dye sensitized solar cells
Journal of Physical Chemistry C, 2010Co-Authors: Sadia Ameen, Shaheer M Akhtar, Obong Yang, Hyungshik ShinAbstract:Uniform polyaniline nanofibers (PANI NFs) and chemically doped Sulfamic Acid (SFA) PANI NFs, synthesized via template free interfacial polymerization process, were used as new counter electrodes materials for the fabrication of the highly efficient dye-sensitized solar cells (DSSCs). The PANI NFs-based fabricated DSSCs exhibited a solar-to-electricity conversion efficiency of ∼4.0%, while the SFA-doped PANI NFs-based DSSC demonstrated ∼27% improvement in the solar-to-electricity conversion efficiency. The obtained solar-to-electricity conversion efficiency for SFA-doped PANI NFs-based DSSC was 5.5% under 100 mW/cm2 (AM1.5). The enhancement in the conversion efficiency was due to the incorporation of SFA into the PANI NFs, which resulted in the higher electrocatalytic activity for the I3−/I− redox reaction.
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Sulfamic Acid doped polyaniline nanofibers thin film based counter electrode application in dye sensitized solar cells
Journal of Physical Chemistry C, 2010Co-Authors: Sadia Ameen, Shaheer M Akhtar, Young Soon Kim, Obong Yang, Hyungshik ShinAbstract:Uniform polyaniline nanofibers (PANI NFs) and chemically doped Sulfamic Acid (SFA) PANI NFs, synthesized via template free interfacial polymerization process, were used as new counter electrodes ma...
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electrical conductivity and dielectric properties of Sulfamic Acid doped polyaniline
Current Applied Physics, 2007Co-Authors: Sadia Ameen, Vazid Ali, M Zulfequar, Mazharul M Haq, M HusainAbstract:Abstract The temperature and frequency dependence of dielectric constant ( e ′) and dielectric loss ( e ″) is studied for different samples of polyaniline (PANI), doped with different concentration of Sulfamic Acid in the frequency range (10–100 kHz) and temperature range (300–400 K). The dc conductivity has also been measured to see the effect of Sulfamic Acid and the conduction mechanism has been explained by the propagation of polaron through a conjugated polymer chain due to shifting of double bonds (alternation), which gives rise to electrical conduction.
