Silica gel and polystyrene supported aluminum chloride as heterogeneous catalysts for the preparation of α-aminophosphonates

2010 ◽  
Vol 21 (6) ◽  
pp. 418-422 ◽  
Author(s):  
Kaveh Parvanak Boroujeni ◽  
Amir Nasrolahi Shirazi
Keyword(s):  
Silica Gel ◽  
Aluminum Chloride ◽  
Heterogeneous Catalysts

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.

Electrophilic cyclization of an olefinic β-keto ester

1981 ◽  
Vol 59 (14) ◽  
pp. 2239-2241 ◽  
Author(s):  
Margot Alderdice ◽  
Larry Weiler
Keyword(s):  
Silica Gel ◽  
Aluminum Chloride ◽  
Cyclization Reaction ◽  
Electrophilic Cyclization ◽  
Keto Ester ◽  
Potential Use

Benzeneselenenyl chloride and aluminum chloride or benzenesulphenyl chloride and silica gel initiate an electrophilic cyclization of methyl 7-methyl-3-oxo-7-octenoate to cyclohexyl derivatives. These products of the cyclization reaction have been converted into intermediates of potential use in the synthesis of unusual carotenoids.

Supported Heteropolyacids as Heterogeneous Catalysts for Propene Metathesis

1995 ◽  
Vol 60 (3) ◽  
pp. 443-450 ◽  
Author(s):  
Pavol Hudec ◽  
Katarina Prandová
Keyword(s):  
Surface Properties ◽  
Silica Gel ◽  
Heterogeneous Catalysts ◽  
Keggin Type

Catalysts containing tungsten or molybdenum in the form of Keggin type heteropolyacids, like H3PW12O40, H4SiW12O40 and H3PMo12O40, supported on silica gel were prepared. The acid and surface properties of heteropolyacids and their supported forms are discussed. Keggin type heteropolyacids supported on silica gel have been found active for propene metathesis, the activity was compared with those of the classical catalyst WO3/SiO2. The highest activity and selectivity for studied reaction showed catalyst prepared on the base of H3PW12O40.

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.

Silica gel-based adsorbents prepared via homogeneous and heterogeneous routes: adsorption properties and recycling as heterogeneous catalysts

2017 ◽  
Vol 66 (12) ◽  
pp. 1913-1920 ◽  
Author(s):  
Jin Meng ◽  
Fu Rao ◽  
Sun Changmei ◽  
Qu Rongjun ◽  
Zhang Ying
Keyword(s):  
Silica Gel ◽  
Heterogeneous Catalysts ◽  
Adsorption Properties
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