scholarly journals Cover Picture: Metal-Free Dehydration of Glucose to 5-(Hydroxymethyl)furfural in Ionic Liquids with Boric Acid as a Promoter (Chem. Eur. J. 5/2011)

2011 ◽  
Vol 17 (5) ◽  
pp. 1369-1369 ◽  
Author(s):  
Tim Ståhlberg ◽  
Sergio Rodriguez-Rodriguez ◽  
Peter Fristrup ◽  
Anders Riisager
Keyword(s):  
Ionic Liquids ◽  
Boric Acid ◽  
Metal Free ◽  
Hydroxymethyl Furfural

Metal-Free Dehydration of Glucose to 5-(Hydroxymethyl)furfural in Ionic Liquids with Boric Acid as a Promoter

2011 ◽  
Vol 17 (5) ◽  
pp. 1456-1464 ◽  
Author(s):  
Tim Ståhlberg ◽  
Sergio Rodriguez-Rodriguez ◽  
Peter Fristrup ◽  
Anders Riisager
Keyword(s):  
Ionic Liquids ◽  
Boric Acid ◽  
Metal Free ◽  
Hydroxymethyl Furfural

Transition-metal-free borylation of propargylic alcohols: structurally variable synthesis in ionic liquid medium

2019 ◽  
Vol 6 (11) ◽  
pp. 1895-1899 ◽  
Author(s):  
Sangepu Bhavanarushi ◽  
Yin Xu ◽  
Imran Khan ◽  
Zhibin Luo ◽  
Bin Liu ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Transition Metal ◽  
Liquid Medium ◽  
Propargylic Alcohols ◽  
Metal Free ◽  
Ionic Liquid Medium

Transition-metal-free borylation of unactivated propargylic alcohols in basic ionic liquids allowed the construction of various highly functionalized vinylboronates.

ChemInform Abstract: Synthesis of Metal-Free Phthalocyanines in Functionalized Ammonium Ionic Liquids.

ChemInform ◽  
2008 ◽  
Vol 39 (5) ◽  
Author(s):  
S. M. S. Chauhan ◽  
Shweta Agarwal ◽  
Pratibha Kumari
Keyword(s):  
Ionic Liquids ◽  
Metal Free ◽  
Ammonium Ionic Liquids

scholarly journals Development of coalescents for paints and varnishes based on ionic liquids – the products of diethanolamine and inorganic acids interaction

2021 ◽  
Vol 2 (6 (110)) ◽  
pp. 21-29
Author(s):  
Yevhenii Levchenko ◽  
Olga Sverdlikovska ◽  
Denys Chervakov ◽  
Oleh Chervakov
Keyword(s):  
Ionic Liquids ◽  
Boric Acid ◽  
Complex Compound ◽  
Film Formation ◽  
Hardness Index ◽  
Aqueous Dispersions ◽  
Water Dispersion ◽  
Inorganic Acids ◽  
Ionogenic Compounds ◽  
Polyurethane Dispersions

This paper reports the synthesis of ionic liquids through the interaction between diethanolamine and orthophosphate and boric acids in order to establish the possibility of replacing volatile coalescents in a formulation for paints and varnishes with ionogenic compounds. The results from studying the influence of polymeric coalescents based on ionic liquids on the rheological properties of water-dispersion paints and varnishes of different nature are presented. It has been established that the synthesized coalescents could be used to modify the properties of paints and varnishes based on polyurethane and styrene-acrylic aqueous dispersions. It has been shown that the product of the interaction between diethanolamine and boric acid in aqueous solutions forms an ionogenic complex compound with a unipolar conductivity in terms of ОН─ ions. It was also established that when introduced to the formulation of water-dispersion paints and varnishes, the solutions of modifiers produce a diluting action. The influence of ionic liquids on the process of film formation of aqueous dispersions of polymers and pigmented paints and varnishes based on them was investigated. It was established that the synthesized ionogenic compounds are not inferior, in terms of their effectiveness, to the widespread conventional industrial coalescents of the Texanol→ type. Therefore, there is reason to assert the possibility of replacing the industrial coalescent Texanol→ in the formulation of pigmented water-dispersion paints and varnishes based on styrene-acrylic and polyurethane dispersions with fundamentally new synthesized ionogenic modifiers. Thus, the coatings with a coalescent based on ion liquid of diethanolamine borate have a higher level of conditional hardness, which exceeds by 17 % the hardness index of the paint made on the basis of the conventional Texanol→ type coalescent, without changing its decorative properties, such as color and shine

Tailoring Molecular Weight of Bioderived Polycarbonates via Bifunctional Ionic Liquids Catalysts under Metal-Free Conditions

2018 ◽  
Vol 6 (2) ◽  
pp. 2684-2693 ◽  
Author(s):  
Congkai Ma ◽  
Fei Xu ◽  
Weiguo Cheng ◽  
Xin Tan ◽  
Qian Su ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Ionic Liquids ◽  
Metal Free

scholarly journals Simultaneous upgrading of biomass-derived sugars to HMF/furfural via enzymatically isomerized ketose intermediates

2019 ◽  
Vol 12 (1) ◽  
Author(s):  
Wei Wang ◽  
Ashutosh Mittal ◽  
Heidi Pilath ◽  
Xiaowen Chen ◽  
Melvin P. Tucker ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Reaction Time ◽  
Carboxylic Acids ◽  
Chemical Process ◽  
Sodium Borate ◽  
Side Reactions ◽  
Acid Catalysts ◽  
Hydroxymethyl Furfural ◽  
Dehydration Reactions ◽  
Biphasic Systems

Abstract Background Recently, exploring fermentative or chemical pathways that convert biomass-derived sugars to fuels/chemicals has attracted a lot of interest from many researchers. We are investigating a hydrocarbon pathway from mixed sugars via 5-hydroxymethyl furfural (HMF) and furfural intermediates. To achieve this goal, we must first convert glucose and xylose to HMF and furfural in favorable yields. Current processes to produce HMF/furfural generally involve the use of acid catalysts in biphasic systems or solvents such as ionic liquids. However, the yield from transforming glucose to HMF is lower than the yield of furfural from xylose. Results In this study, we present an efficient chemical pathway simultaneously transforming glucose and xylose to HMF and furfural via ketose intermediates, i.e., fructose and xylulose, which were generated from glucose and xylose via enzymatic isomerization. In the enzymatic isomerization, by adding sodium borate to complex with the ketoses, xylose conversion reached equilibrium after 2 h with a conversion of 91% and glucose conversion reached 84% after 4 h. By enzymatically isomerizing the aldoses to ketoses, the following dehydration reactions to HMF and furfural could be performed at low process temperatures (i.e., 110–120 °C) minimizing the side reactions of the sugars and limiting the degradation of furfurals to humins and carboxylic acids. At 120 °C, pH 0.5, and 15 min reaction time, mixed ketose sugars were converted to HMF and furfural in yields of 77% and 96%, respectively (based on starting aldose concentrations). Conclusion Taken together, our results demonstrate that this combined biological and chemical process could be an effective pathway to simultaneously convert biomass-derived glucose and xylose to HMF and furfural, for use as intermediates in the production of hydrocarbons.

Conversion of concentrated sugar solutions into 5-hydroxymethyl furfural and furfural using Brönsted acidic ionic liquids

2015 ◽  
Vol 5 (12) ◽  
pp. 5086-5090 ◽  
Author(s):  
B. M. Matsagar ◽  
M. K. Munshi ◽  
A. A. Kelkar ◽  
P. L. Dhepe
Keyword(s):  
Ionic Liquids ◽  
Hydroxymethyl Furfural ◽  
Acidic Ionic Liquids ◽  
Renewable Sugars ◽  
High Yields

Using recyclable and green ionic liquids in catalytic amounts, renewable sugars are dehydrated into furans with high yields.

A remarkable effect of ionic liquids in transition-metal-free aerobic oxidation of benzylic alcohols

2011 ◽  
Vol 52 (41) ◽  
pp. 5392-5394 ◽  
Author(s):  
Yoshiro Oda ◽  
Koji Hirano ◽  
Tetsuya Satoh ◽  
Susumu Kuwabata ◽  
Masahiro Miura
Keyword(s):  
Ionic Liquids ◽  
Transition Metal ◽  
Aerobic Oxidation ◽  
Remarkable Effect ◽  
Benzylic Alcohols ◽  
Metal Free
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