scholarly journals Silica Gel-Induced Aryne Generation from o-Triazenylarylboronic Acids as Stable Solid Precursors

2021 ◽  
Author(s):  
Motoki Ito ◽  
Yuka Yamabayashi ◽  
Mio Oikawa ◽  
Emi Kano ◽  
Kazuhiro Higuchi ◽  
...  
Keyword(s):  
Silica Gel ◽  
Mild Conditions ◽  
Shelf Stable

We report the development of o-triazenylarylboronic acids as shelf-stable solid aryne precursors, which generate (hetero)arynes under remarkably mild conditions using silica gel as the sole reagent and undergo reactions with...

Perfluoro-tagged rhodium and ruthenium nanoparticles immobilized on silica gel as highly active catalysts for hydrogenation of arenes under mild conditions

2013 ◽  
Vol 37 (2) ◽  
pp. 278-282 ◽  
Author(s):  
Sandra Niembro ◽  
Silvia Donnici ◽  
Alexandr Shafir ◽  
Adelina Vallribera ◽  
María L. Buil ◽  
...  
Keyword(s):  
Silica Gel ◽  
Ruthenium Nanoparticles ◽  
Mild Conditions ◽  
Highly Active

Ionic Liquid [Bmim]OH Grafted Catalyst for Cycloaddition of Carbon Dioxide

2014 ◽  
Vol 989-994 ◽  
pp. 676-679 ◽  
Author(s):  
Xue Lan Zhang ◽  
Deng Feng Wang
Keyword(s):  
Carbon Dioxide ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Silica Gel ◽  
Propylene Carbonate ◽  
Propylene Oxide ◽  
Heterogeneous Catalysts ◽  
Element Analysis ◽  
Mild Conditions ◽  
Adsorption Desorption

An ionic liquid 1-butyl-3-methylimidazolium hydroxide ([Bmim]OH) was grafted on silica gel by post-grafting method. Such grafted ionic liquids (GILs) which were verified by means of FTIR, element analysis N2adsorption-desorption and TG could be used as highly effective heterogeneous catalysts toward propylene carbonate synthesis through cycloaddition of carbon dioxide with propylene oxide under solventless and mild conditions.

Preparation and Activity of Ionic Liquid Catalysts Grafted on Hydrophobic Silica Gel

2012 ◽  
Vol 476-478 ◽  
pp. 2621-2624
Author(s):  
Xue Lan Zhang ◽  
Deng Feng Wang
Keyword(s):  
Carbon Dioxide ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Silica Gel ◽  
Propylene Oxide ◽  
Heterogeneous Catalysts ◽  
N2 Adsorption ◽  
Mild Conditions ◽  
Hydrophobic Silica ◽  
Adsorption Desorption

An ionic liquid 1- (triethoxysilyl) propyl-3-methylimidazolium hydroxide ([Smim]OH) was grafted on three kinds of mesoporous hydrophobic silica gel by means of post-grafting under mild conditions. The catalysts were [Smim]OH/SiO2-MTES (methyltriethoxysilane), [Smim]OH/SiO2-TMCS (trimethylchlorosilane), [Smim]OH/SiO2-CPTEO (triethoxysilyl propyl chloride). Such grafted ionic liquids (GILs), which were characterized by means of FTIR and N2 adsorption-desorption could be used as effective heterogeneous catalysts toward propylene carbonate synthesis through cycloaddition of carbon dioxide with propylene oxide under solventless and mild conditions.

scholarly journals d-Idose, d-Iduronic Acid, and d-Idonic Acid from d-Glucose via Seven-Carbon Sugars

Molecules ◽  
2019 ◽  
Vol 24 (20) ◽  
pp. 3758
Author(s):  
Zilei Liu ◽  
Sarah F. Jenkinson ◽  
Akihide Yoshihara ◽  
Mark R. Wormald ◽  
Ken Izumori ◽  
...  
Keyword(s):  
Silica Gel ◽  
Selective Reduction ◽  
Building Blocks ◽  
Rare Sugar ◽  
Mild Conditions ◽  
Iduronic Acid ◽  
Practical Synthesis

A practical synthesis of the very rare sugar d-idose and the stable building blocks for d-idose, d-iduronic, and d-idonic acids from ido-heptonic acid requires only isopropylidene protection, Shing silica gel-supported periodate cleavage of the C6-C7 bond of the heptonic acid, and selective reduction of C1 and/or C6. d-Idose is the most unstable of all the aldohexoses and a stable precursor which be stored and then converted under very mild conditions into d-idose is easily prepared.

Visible light-promoted difluoromethylthiolation of aryldiazonium salts

2018 ◽  
Vol 16 (44) ◽  
pp. 8565-8568 ◽  
Author(s):  
Wengui Wang ◽  
Shuxiang Zhang ◽  
Huaiqing Zhao ◽  
Shoufeng Wang
Keyword(s):  
Visible Light ◽  
Mild Conditions ◽  
Stable Reagent ◽  
Shelf Stable

Difluoromethylthiolation of aryldiazonium salts under mild conditions using a shelf-stable reagent (PhSO2SCF2H) was reported.

scholarly journals Regioselective 1,4-trifluoromethylation of α,β-unsaturated ketones via a S-(trifluoromethyl)diphenylsulfonium salts/copper system

2013 ◽  
Vol 9 ◽  
pp. 2189-2193 ◽  
Author(s):  
Satoshi Okusu ◽  
Yutaka Sugita ◽  
Etsuko Tokunaga ◽  
Norio Shibata
Keyword(s):  
Unsaturated Ketones ◽  
Mild Conditions ◽  
Wide Range ◽  
Shelf Stable

Regioselective conjugate 1,4-trifluoromethylation of α,β-unsaturated ketones by the use of shelf-stable electrophilic trifluoromethylating reagents, S-(trifluoromethyl)diphenylsulfonium salts and copper under mild conditions is described. A wide range of acyclic aryl–aryl–enones and aryl–alkyl–enones were converted into β-trifluoromethylated ketones in low to moderate yields.

scholarly journals Process for coating surfaces with a copolymer made from sulfur and dicyclopentadiene

2021 ◽  
Author(s):  
Maximilian Mann ◽  
Bowen Zhang ◽  
Samuel Tonkin ◽  
Christopher Gibson ◽  
Zhongfan Jia ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Metal Surface ◽  
Silica Gel ◽  
Mercury Removal ◽  
Low Molecular Weight ◽  
Water Mixture ◽  
Curing Process ◽  
Resistant Material ◽  
Corrosion Resistant ◽  
Shelf Stable

The reaction between sulfur and dicyclopentadiene was optimised to form a shelf stable and soluble low molecular weight oligomer. After a simple curing process at 140 °C the material was rendered insoluble and resistant to acids and solvents. Taking advantage of the soluble oligomer, a metal surface was coated with the dissolved material which was then cured to show that a copolymer layer can act as a corrosion resistant material. Further, silica gel was coated with the soluble oligomer to test mercury removal applications. Even after curing, the polymer coated silica was an effective mercury sorbent. Additionally, the sorbent was also used to remove mercury form a diesel and water mixture indicating that mercury removal from a mixture of organic and aqueous substances is possible with this system.

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