The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform
J. Scott Sawyer - One of the best experts on this subject based on the ideXlab platform.
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Synthesis of diaryl ethers, diaryl thioethers, and diarylamines mediated by Potassium Fluoride-alumina and 18-crown-6
The Journal of Organic Chemistry, 1993Co-Authors: Elisabeth A. Schmittling, J. Scott SawyerAbstract:An efficient alternative to the copper-catalyzed synthesis (Ullmann ether synthesis) of diaryl ethers, diaryl thioethers, and diarylamines involving the Potassium Fluoride-alumina-mediated addition of a phenol, thiophenol, or an aniline to 2- or 4-fluorobenzonitriles catalyzed by 18-crown-6 is described
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Selective desilylation of tert-butyldimethylsilyl ethers of phenols using Potassium Fluoride-alumina and ultrasound
Tetrahedron Letters, 1991Co-Authors: Elisabeth A. Schmittling, J. Scott SawyerAbstract:Abstract The use of Potassium Fluoride on basic alumina in acetonitrile with ultrasound for the selecting deprotection of tert -butyldimethylsilyl ethers of phenols is described. The method, which features a non-aqueous work-up, readily cleaves tert- butyldimethylsilyl ethers of phenols at room temperature, whereas tert -butyldimethylsilyl ethers of benzyl alcohols or 2-(trimethylsilyl)ethoxymethyl ethers of phenols are stable.
Alessandro Palmieri - One of the best experts on this subject based on the ideXlab platform.
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reaction of 3 1 arylsulfonylalkyl indoles with easily enolisable derivatives promoted by Potassium Fluoride on basic alumina
Advanced Synthesis & Catalysis, 2008Co-Authors: Roberto Ballini, Alessandro Palmieri, Marino Petrini, Rafik Rajjak ShaikhAbstract:Active methylene compounds and nitro derivatives react with 3-(1-arylsulfonylalkyl)-indoles in the presence of Potassium Fluoride on basic alumina at room temperature leading to the corresponding adducts in good yields. Under basic conditions, sulfonylindoles suffer elimination of arenesulfinic acid leading to an intermediate vinylogous imine that promptly adds stabilized carbanions. The obtained 3-indolyl derivatives are pivotal intermediates for the synthesis of indole-based alkaloids and amino acids.
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Potassium Fluoride basic alumina as far superior heterogeneous catalyst for the chemoselective conjugate addition of nitroalkanes to electron poor alkenes having two electron withdrawing groups in α and β positions
Advanced Synthesis & Catalysis, 2006Co-Authors: Roberto Ballini, Alessandro PalmieriAbstract:The chemoselective, conjugate addition of nitroalkanes to electron-poor alkenes, with two electron-withdrawing groups in the α- and §-positions, can be easily performed at room temperature under solventless conditions using Potassium Fluoride/basic alumina as heterogeneous catalyst.
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Potassium Fluoride/Basic Alumina as Far Superior Heterogeneous Catalyst for the Chemoselective Conjugate Addition of Nitroalkanes to Electron‐Poor Alkenes Having Two Electron‐Withdrawing Groups in α‐ and β‐Positions
Advanced Synthesis & Catalysis, 2006Co-Authors: Roberto Ballini, Alessandro PalmieriAbstract:The chemoselective, conjugate addition of nitroalkanes to electron-poor alkenes, with two electron-withdrawing groups in the alpha- and beta-positions, can be easily performed at room temperature under solventless conditions using Potassium Fluoride/basic alumina as heterogeneous catalyst
Elisabeth A. Schmittling - One of the best experts on this subject based on the ideXlab platform.
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Synthesis of diaryl ethers, diaryl thioethers, and diarylamines mediated by Potassium Fluoride-alumina and 18-crown-6
The Journal of Organic Chemistry, 1993Co-Authors: Elisabeth A. Schmittling, J. Scott SawyerAbstract:An efficient alternative to the copper-catalyzed synthesis (Ullmann ether synthesis) of diaryl ethers, diaryl thioethers, and diarylamines involving the Potassium Fluoride-alumina-mediated addition of a phenol, thiophenol, or an aniline to 2- or 4-fluorobenzonitriles catalyzed by 18-crown-6 is described
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Selective desilylation of tert-butyldimethylsilyl ethers of phenols using Potassium Fluoride-alumina and ultrasound
Tetrahedron Letters, 1991Co-Authors: Elisabeth A. Schmittling, J. Scott SawyerAbstract:Abstract The use of Potassium Fluoride on basic alumina in acetonitrile with ultrasound for the selecting deprotection of tert -butyldimethylsilyl ethers of phenols is described. The method, which features a non-aqueous work-up, readily cleaves tert- butyldimethylsilyl ethers of phenols at room temperature, whereas tert -butyldimethylsilyl ethers of benzyl alcohols or 2-(trimethylsilyl)ethoxymethyl ethers of phenols are stable.
Ashok K Ganguli - One of the best experts on this subject based on the ideXlab platform.
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Potassium Fluoride doped LaOFeAs multiband superconductors: Evidence for extremely high upper critical field
arXiv: Superconductivity, 2008Co-Authors: S. K. Singh, J Prakash, D. Srikala, A. K. Singh, Satyabrata Patnaik, Ashok K GanguliAbstract:We describe a new methodology of synthesizing the oxypnictide superconductors with Potassium Fluoride as a source as a source of fluorine instead of LaF3. This route also allows the substitution of Potassium at lanthanum sites which leads to an increase in the upper critical field as would be expected for a multiband superconductor. We also report the highest reported Tc onset of 28.5K and highest upper critical field in these superconductors.
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Potassium Fluoride doped LaOFeAs multi-band superconductor: Evidence of extremely high upper critical field
EPL, 2008Co-Authors: J Prakash, Saroj Patnaik, S. L. Samal, S. J. Singh, Ashok K GanguliAbstract:The recently discovered superconductors based on oxypnictides have rekindled the search for new\n non-copper based high- T c superconductors. After the initial report by Kamihara et al . of\n superconductivity in (La-O/F-Fe-As)-based compounds, there have been several reports on these new\n superconductors but the synthesis of pure phases of these oxypnictides has remained a challenge.\n Here we describe a new methodology of synthesizing these oxypnictide superconductors with the\n commonly available Potassium Fluoride (KF) as a source of fluorine instead of the expensive LaF 3 .\n This route also allows the substitution of Potassium at lanthanum sites which leads to an increase\n in the upper critical field as would be expected for a multi-band superconductor. We also report the\n highest- T c (onset) of 28.50 K and highest upper critical field at ambient pressure in the family\n of La-based oxypnictides.
Zhenlun Song - One of the best experts on this subject based on the ideXlab platform.
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Rethink about electrolyte: Potassium Fluoride as a promising additive to an electrolyte for the water oxidation by a nanolayered Mn oxide
International Journal of Hydrogen Energy, 2017Co-Authors: Mohammad Mahdi Najafpour, Seyedeh Maedeh Hosseini, Mohadeseh Zarei Ghobadi, Parvin Rafighi, Robabeh Bagheri, Keun Hwa Chae, Somayeh Mehrabani, Zhenlun SongAbstract:Abstract Water oxidation is a bottleneck of the hydrogen production through the water-splitting reaction. Herein, the promising role of Fluoride on the water-oxidizing activity of a nanolayered Mn oxide under the electrochemical condition is reported. The experiments show the increase of the water-oxidizing activity of the nanolayered Mn oxide under an electro-water oxidation circumstance in the presence of Potassium Fluoride as a promising additive to an electrolyte. As a result, the required overpotential is decreased and the yield of oxygen evolution raised in the water-oxidation reaction.
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treated nanolayered mn oxide by Potassium Fluoride an improvement for nanolayered mn oxide toward water oxidation
International Journal of Hydrogen Energy, 2016Co-Authors: Mohammad Mahdi Najafpour, Seyedeh Maedeh Hosseini, Mohadeseh Zarei Ghobadi, Parvin Rafighi, Robabeh Bagheri, Zhenlun SongAbstract:Water splitting can store sustainable energies in the form of fuel (H2) and oxidant (O2). However, the efficiency of H2 production from the reaction is limited by the slow kinetics of the water oxidation. Herein the promising role of Fluoride on water-oxidizing activity of nanolayered Mn oxide is reported. The effects were studied for water oxidation in the presence of cerium(IV) ammonium nitrate. These experiments showed that the treatment of nanolayered Mn oxide by Potassium Fluoride increases water-oxidizing activity of these oxides in the presence of cerium(IV) ammonium nitrate approximately two times.