Synthesis of a silica-immobilized Brönsted acidic ionic liquid catalyst and hydrolysis of cellulose in water under mild conditions

The metal salt – Brønsted acidic ionic liquid system composed of ZnCl2·1.74H2O-1-(1-propylsulfonic)-3-methylimidazolium chloride can directly hydrolyze untreated cellulose in 78% total reducing sugar and 19% glucose yield at 37 °C, 1 atm in 4.0 days.

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Efficient pseudo five-component synthesis of 4,4′-(arylmethylene)-bis(3-methyl-1-phenyl-1H-pyrazol-5-ol) derivatives promoted by a novel ionic liquid catalyst

Zeitschrift für Naturforschung B ◽

10.1515/znb-2017-0179 ◽

2018 ◽

Vol 73 (3-4) ◽

pp. 191-195 ◽

Cited By ~ 2

Author(s):

Zahra Abshirini ◽

Abdolkarim Zare

Keyword(s):

Ionic Liquid ◽

Disulfonic Acid ◽

Thermal Gravimetric ◽

One Pot ◽

Mild Conditions ◽

Acidic Ionic Liquid ◽

Brønsted Acidic Ionic Liquid ◽

The One ◽

C Nmr

AbstractIn this research, initial production and characterization of a novel Brønsted-acidic ionic liquid, namely,N,N,N′,N′-tetramethylethylenediaminium-N,N′-disulfonic acid hydrogen sulfate ([TMEDSA][HSO4]2), has been described (characterization was achieved using Fourier-transform infrared spectroscopy,1H nuclear magnetic resonance (NMR),13C NMR, and mass and thermal gravimetric spectra). Thereafter, utilization of [TMEDSA][HSO4]2as a highly effectual catalyst for the synthesis of 4,4′-(arylmethylene)-bis(3-methyl-1-phenyl-1H-pyrazol-5-ol) derivatives through the one-pot pseudo five-component reaction of phenylhydrazine (2 eq.) with ethyl acetoacetate (2 eq.) and arylaldehydes (1 eq.) in relatively mild conditions, has been reported.

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Synthesis of a sulfonic acid functionalized acidic ionic liquid modified silica catalyst and applications in the hydrolysis of cellulose

Catalysis Communications ◽

10.1016/j.catcom.2010.05.012 ◽

2010 ◽

Vol 11 (13) ◽

pp. 1072-1075 ◽

Cited By ~ 139

Author(s):

Ananda S. Amarasekara ◽

Onome S. Owereh

Keyword(s):

Ionic Liquid ◽

Sulfonic Acid ◽

Modified Silica ◽

Acidic Ionic Liquid ◽

Hydrolysis Of Cellulose ◽

Hydrolysis Of

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1-(1-Propylsulfonic)-3-methylimidazolium chloride acidic ionic liquid catalyzed hydrolysis of cellulose in water: Effect of metal ion co-catalysts

Catalysis Communications ◽

10.1016/j.catcom.2015.08.004 ◽

2015 ◽

Vol 70 ◽

pp. 82-85 ◽

Cited By ~ 17

Author(s):

Bernard Wiredu ◽

Ananda S. Amarasekara

Keyword(s):

Ionic Liquid ◽

Metal Ion ◽

Water Effect ◽

Co Catalysts ◽

Acidic Ionic Liquid ◽

Hydrolysis Of Cellulose ◽

Hydrolysis Of

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Brönsted Acidic Ionic Liquid 1-(1-Propylsulfonic)-3-methylimidazolium-Chloride Catalyzed Hydrolysisof D-Cellobiose in Aqueous Medium

International Journal of Carbohydrate Chemistry ◽

10.1155/2012/948652 ◽

2012 ◽

Vol 2012 ◽

pp. 1-6 ◽

Cited By ~ 12

Author(s):

Ananda S. Amarasekara ◽

Bernard Wiredu

Keyword(s):

Ionic Liquid ◽

Catalytic Activity ◽

Sulfuric Acid ◽

Acid Group ◽

H Nmr ◽

Acidic Ionic Liquid ◽

Brønsted Acidic Ionic Liquid ◽

Cellobiose Hydrolysis ◽

Glucose Anomers ◽

Hydrolysis Of

Brönsted acidic ionic liquid 1-(1-propylsulfonic)-3-methylimidazolium chloride (PSMIMCl) shows a higher catalytic activity than sulfuric acid in the hydrolysis of D-cellobiose to D-glucose in water at 90–120°C. This catalytic activity enhancement is more significant at higher temperatures, and at 120°C, PSMIMCl produced 64.5% glucose yield, whereas H2SO4 produced only 42.2% after 40 min. reaction, and this is a 52.8% enhancement of catalytic activity due to the alkylimidazolium group attached to the sulfonic acid group. 1H NMR monitoring of the D-cellobiose hydrolysis in PSMIMCl and sulfuric acid mediums failed to reveal intermediates in the hydrolysis reaction, and this is probably due to rapid conversion of the intermediate(s) to a mixture of D-glucose anomers with α:β≈1:1.6.

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