Effects of reaction conditions on the acid-catalyzed hydrolysis of miscanthus dissolved in an ionic liquid

2011 ◽  
Vol 13 (6) ◽  
pp. 1467 ◽  
Author(s):  
Sean Dee ◽  
Alexis T. Bell
Keyword(s):  
Ionic Liquid ◽  
Reaction Conditions ◽  
Acid Catalyzed ◽  
Hydrolysis Of

scholarly journals Synthesis of High-Purity Silica Nanoparticles by Sol-Gel Method

2017 ◽  
Vol 19 (4) ◽  
pp. 295 ◽  
Author(s):  
S.V. Lazareva ◽  
N.V. Shikina ◽  
L.E. Tatarova ◽  
Z.R. Ismagilov
Keyword(s):  
Particle Size ◽  
Sol Gel ◽  
Sio2 Content ◽  
Reaction Conditions ◽  
Minimum Particle Size ◽  
Size Stability ◽  
Different Temperatures ◽  
Acid Catalyzed ◽  
Silica Sols ◽  
Hydrolysis Of

Colloidal silica (silica sol) nanoparticles were synthesized by ammonia- and hydrochloric acid-catalyzed hydrolysis of tetraethoxysilane with subsequent condensation and polymerization. Silica particles with the size of 12‒160 nm were obtained at different temperatures and ratios of the initial reactants and studied by means of TEM, AFM, IR spectroscopy and zeta-potential measurements. The reaction conditions providing the minimum particle size in the final product of the most complete hydrolysis were determined. At pH above 8.5, an increase in the SiO2 content of the sol to 23 wt.% did not change the particle size. At a low (~ 1.8 wt.%) SiO2 content of the sol, a wide variation in pH also did not exert a significant effect on the particle size. Stability of the silica sols synthesized in an alkaline medium was enhanced by the replacement of alcohol with water during evaporation at pH 8.5‒9.5. The possibility to produce silica sols with the required characteristics (particle size, pH, stability, purity, and SiO2 content in an aqueous or alcohol medium) makes them applicable in various industries.

An ultrasonic-ionic liquid process for the efficient acid catalyzed hydrolysis of feather keratin

2019 ◽  
Vol 27 (3) ◽  
pp. 660-667 ◽  
Author(s):  
Song Ding ◽  
Yang Sun ◽  
Hongyue Chen ◽  
Chao Xu ◽  
Yi Hu
Keyword(s):  
Ionic Liquid ◽  
Feather Keratin ◽  
Acid Catalyzed ◽  
Hydrolysis Of ◽  
Liquid Process

Sulfuric Acid-Catalyzed Conversion of Alkynes to Ketones in an Ionic Liquid Medium under Mild Reaction Conditions

ACS Catalysis ◽  
2011 ◽  
Vol 1 (2) ◽  
pp. 116-119 ◽  
Author(s):  
Wing-Leung Wong ◽  
Kam-Piu Ho ◽  
Lawrence Yoon Suk Lee ◽  
Kin-Ming Lam ◽  
Zhong-Yuan Zhou ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Sulfuric Acid ◽  
Liquid Medium ◽  
Reaction Conditions ◽  
Acid Catalyzed ◽  
Ionic Liquid Medium

scholarly journals A Brønsted Acid-Catalyzed Multicomponent Reaction for the Synthesis of Highly Functionalized γ-Lactam Derivatives

Molecules ◽  
2019 ◽  
Vol 24 (16) ◽  
pp. 2951 ◽  
Author(s):  
Corte ◽  
Marigorta ◽  
Palacios ◽  
Vicario
Keyword(s):  
Phosphoric Acid ◽  
Multicomponent Reaction ◽  
Mannich Reaction ◽  
Acid Catalyst ◽  
Selective Hydrolysis ◽  
Reaction Conditions ◽  
Amide Derivatives ◽  
Acid Catalyzed ◽  
Hydrolysis Of

Brønsted acids catalyze a multicomponent reaction of benzaldehyde with amines and diethyl acetylenedicarboxylate to afford highly functionalized γ-lactam derivatives. The reaction consists of a Mannich reaction of an enamine to an imine, both generated in situ, promoted by a phosphoric acid catalyst and a subsequent intramolecular cyclization. The hydrolysis of the cyclic enamine substrate can provide enol derivatives and, moreover, a second attack of the amine on the carboxylate can afford amide derivatives. An optimization of the reaction conditions is presented in order to obtain selectively cyclic enamines that can afford the enol species after selective hydrolysis.

Synthesis and Characterization of Rutile and Anatase in Air- and Water-Stable Ionic Liquids with and without Isopropanol as a Cosolvent

2008 ◽  
Vol 61 (9) ◽  
pp. 704 ◽  
Author(s):  
Mohammad Al Zoubi ◽  
Hala K. Farag ◽  
Frank Endres
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Rutile Phase ◽  
Synthesis And Characterization ◽  
Reaction Conditions ◽  
Nanocrystalline Tio2 ◽  
Moderate Reaction ◽  
Solvent Type ◽  
Hydrolysis Of

Nanocrystalline TiO2 with pure rutile and pure anatase phases was prepared at moderate reaction temperatures by hydrolysis of TiCl4 in different air- and water-stable ionic liquids with the same anion ([Py1,4]Tf2N, [EMIM]Tf2N, and [P14,6,6,6]Tf2N), in isopropanol and in cosolvent of ionic liquid/isopropanol under different reaction conditions. The type of cation in the ionic liquid influences the morphology of the rutile phase: cone-like morphology was obtained in the case of [Py1,4]+ and [P14,6,6,6]+ ions and wormhole-like in the case of [EMIM]+. In the case of anatase, no significant effect was found. The influence of various reaction conditions like acidity of solution, solvent type, precursor type, and precursor concentration on the phase formation and morphology of titania were investigated.

Microwave-assisted direct transformation of lignocellulose into methyl glycopyranoside in ionic liquid

Holzforschung ◽  
2020 ◽  
Vol 74 (3) ◽  
pp. 313-320 ◽  
Author(s):  
Takao Kishimoto ◽  
Mafuyu Saito ◽  
Satoshi Suzuki ◽  
Masahiro Hamada ◽  
Noriyuki Nakajima ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Microwave Irradiation ◽  
Microcrystalline Cellulose ◽  
Value Added ◽  
Reaction Conditions ◽  
Direct Transformation ◽  
Moderate Reaction ◽  
Microwave Assisted ◽  
Combined Use ◽  
Acid Catalyzed

AbstractRecently, conversion of lignocellulose into useful substances has attracted increasing attention. In our previous investigations, microcrystalline cellulose was successfully converted to methyl glucopyranosides (MeGlc) by the combined use of ionic liquid (IL) and microwave irradiation under moderate reaction conditions. In this study, lignocelluloses, including softwood, hardwood, and rice straw, were directly converted to methyl glycopyranosides (MG), including MeGlc, methyl mannopyranosides (MeMan), and methyl xylopyranosides (MeXyl) using acid-catalyzed methanolysis under microwave irradiation in ILs. Lignocellulose ball-milling was quite effective as a crucial process of increasing the yield of MG. Under the optimized reaction conditions, the molar yield of MeGlc reached 40% from softwood, which was a comparable yield from microcrystalline cellulose. MeXyl was also obtained in a 48% yield. These results showed that the combination of the dissolution of ball-milled lignocellulose in IL and the microwave-assisted methanolysis was an effective method of converting lignocellulose into a high-value-added substance.

Efficient Acid-Catalyzed Hydrolysis of Cellulose in Ionic Liquid

2007 ◽  
Vol 349 (11-12) ◽  
pp. 1847-1850 ◽  
Author(s):  
Changzhi Li ◽  
Zongbao K. Zhao
Keyword(s):  
Ionic Liquid ◽  
Hydrolysis Of Cellulose ◽  
Acid Catalyzed ◽  
Hydrolysis Of

Naturally Occurring Organic Acid-catalyzed Facile Diastereoselective Synthesis of Biologically Active (E)-3-(arylimino)indolin-2-one Derivatives in Water at Room Temperature

2019 ◽  
Vol 23 (16) ◽  
pp. 1778-1788 ◽  
Author(s):  
Gurpreet Kaur ◽  
Arvind Singh ◽  
Kiran Bala ◽  
Mamta Devi ◽  
Anjana Kumari ◽  
...  
Keyword(s):  
Room Temperature ◽  
Biologically Active ◽  
Environmentally Benign ◽  
Diastereoselective Synthesis ◽  
Substituted Anilines ◽  
Reaction Conditions ◽  
Naturally Occurring ◽  
Acid Catalyzed ◽  
Reaction Media ◽  
Column Chromatographic

A simple, straightforward and efficient method has been developed for the synthesis of (E)-3-(arylimino)indolin-2-one derivatives and (E)-2-((4-methoxyphenyl)imino)- acenaphthylen-1(2H)-one. The synthesis of these biologically-significant scaffolds was achieved from the reactions of various substituted anilines and isatins or acenaphthaquinone, respectively, using commercially available, environmentally benign and naturally occurring organic acids such as mandelic acid or itaconic acid as catalyst in aqueous medium at room temperature. Mild reaction conditions, energy efficiency, good to excellent yields, environmentally benign conditions, easy isolation of products, no need of column chromatographic separation and the reusability of reaction media are some of the significant features of the present protocol.

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