Synthesis of methylal from methanol and formaldehyde catalyzed by Brønsted acid ionic liquids with different alkyl groups

RSC Advances ◽  
2015 ◽  
Vol 5 (106) ◽  
pp. 87200-87205 ◽  
Author(s):  
Jiahan Sun ◽  
Hansheng Li ◽  
Haoran Song ◽  
Qin Wu ◽  
Yun Zhao ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Catalytic Activity ◽  
Sulfuric Acid ◽  
Sulfonic Acid ◽  
Carbon Chain ◽  
Catalytic Performance ◽  
Carbon Chain Length ◽  
Alkyl Groups ◽  
Toluene Sulfonic Acid ◽  
Concentrated Sulfuric Acid

The carbon chain length of ILs has an effect on its catalytic activity. The ionic liquid of [C6ImBS][HSO4] shows the best catalytic performance which is near that of concentrated sulfuric acid and p-toluene sulfonic acid.

Synthesis of polyoxymethylene dimethyl ethers from methylal and trioxane catalyzed by Brønsted acid ionic liquids with different alkyl groups

RSC Advances ◽  
2015 ◽  
Vol 5 (71) ◽  
pp. 57968-57974 ◽  
Author(s):  
Qin Wu ◽  
Weijiao Li ◽  
Min Wang ◽  
Yu Hao ◽  
Tonghua Chu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ionic Liquids ◽  
Chain Length ◽  
Carbon Chain ◽  
Catalytic Performance ◽  
Carbon Chain Length ◽  
Bronsted Acid ◽  
Alkyl Groups ◽  
Polyoxymethylene Dimethyl Ethers ◽  
Brönsted Acid

The carbon chain length of ILs has effect on its catalytic activity and [C6ImBS][HSO4]shows the best catalytic performance.

Ionic liquid-biosurfactant blends as effective dispersants for oil spills: Effect of carbon chain length and degree of saturation

2021 ◽  
pp. 117119
Author(s):  
Mansoor Ul Hassan Shah ◽  
Ambavaram Vijaya Bhaskar Reddy ◽  
Suzana Yusup ◽  
Masahiro Goto ◽  
Muhammad Moniruzzaman
Keyword(s):  
Ionic Liquid ◽  
Chain Length ◽  
Oil Spills ◽  
Carbon Chain ◽  
Degree Of Saturation ◽  
Carbon Chain Length

Chemical Synthesis of Ascorbyl Palmitate in [BMIM]BF4

2011 ◽  
Vol 236-238 ◽  
pp. 1962-1965 ◽  
Author(s):  
Jun Min Ji
Keyword(s):  
Ascorbic Acid ◽  
Ionic Liquid ◽  
Sulfuric Acid ◽  
Chemical Synthesis ◽  
Palmitic Acid ◽  
Ascorbyl Palmitate ◽  
Highly Efficient ◽  
Concentrated Sulfuric Acid

Scorbyl palmitate is a safty and highly efficient lipophilic antioxidant.It is produced by a novel ionic liquid method: L-ascorbic acid was esterified with palmitic acid to synthesize ascorbyl palmitate,using concentrated sulfuric acid as chemical catalyst in 1-Butyl-3-methy limidazolium terafluoroborate ([BMIM]BF4).The yield of ascorbyl palmitate reached 69.6±1%.

Magnetic Nanoparticles Supported Acidic Ionic Liquid as a Highly Active and Reusable Catalyst for Esterification

2016 ◽  
Vol 852 ◽  
pp. 485-488 ◽  
Author(s):  
Qiang Zhang ◽  
Xin Zhao ◽  
Xue Hua Zhu ◽  
Ji Hang Li
Keyword(s):  
Ionic Liquid ◽  
Catalytic Activity ◽  
Magnetic Nanoparticles ◽  
Catalytic Performance ◽  
Significant Loss ◽  
Reusable Catalyst ◽  
Hydrogen Sulfate ◽  
External Magnet ◽  
Acidic Ionic Liquid ◽  
Highly Active

A magnetic nanoparticles supported dual acidic ionic liquid catalyst was prepared via anchoring 3-sulfobutyl-1-(3-propyltriethoxysilane) imidazolium hydrogen sulfate onto the surface of silica-coated Fe3O4 nanoparticles. And this novel supported acidic ionic liquid catalyst showed good catalytic performance in esterification. More importantly, the catalyst could be easily recovered by an external magnet and reused six times without significant loss of catalytic activity.

scholarly journals Controlling catalytic activity and selectivity for partial hydrogenation by tuning the environment around active sites in iridium complexes bonded to supports

2019 ◽  
Vol 10 (9) ◽  
pp. 2623-2632 ◽  
Author(s):  
Melike Babucci ◽  
Chia-Yu Fang ◽  
Jorge E. Perez-Aguilar ◽  
Adam S. Hoffman ◽  
Alexey Boubnov ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Catalytic Activity ◽  
Active Sites ◽  
Catalytic Performance ◽  
Partial Hydrogenation ◽  
Iridium Complexes

Enveloping atomically dispersed supported iridium with the choice of ionic liquid molecular sheaths and supports controls the catalytic performance.

Preparation, characterization and application of succinimidinium hydrogensulfate ([H-Suc]HSO4) as an efficient ionic liquid catalyst for the N-Boc protection of amines

RSC Advances ◽  
2015 ◽  
Vol 5 (26) ◽  
pp. 19790-19798 ◽  
Author(s):  
Farhad Shirini ◽  
Omid Goli Jolodar ◽  
Mohadeseh Seddighi ◽  
Hojatollah Takbiri Borujeni
Keyword(s):  
Ionic Liquid ◽  
Catalytic Activity ◽  
Sulfuric Acid ◽  
Solvent Free ◽  
Solvent Free Conditions

Succinimidinium hydrogensulfate ([H-Suc]HSO4), which is prepared from the reaction of succinimide and sulfuric acid, showed excellent catalytic activity for the N-Boc protection of various amines under solvent free conditions.

Methylation of polymethylbenzenesulfonic acids by hexamethylbenzene and pentamethylbenzenesulfonic acid in concentrated sulfuric acid

1988 ◽  
Vol 66 (1) ◽  
pp. 162-167 ◽  
Author(s):  
Hans Cerfontain ◽  
Ankie Koeberg-Telder
Keyword(s):  
Sulfuric Acid ◽  
Sulfonic Acid ◽  
Sulfonic Acids ◽  
Substrate Reactivity ◽  
Concentrated Sulfuric Acid

The methylation of a series of polymethylbenzenes (PoMB's) or their sulfonic acids by added hexamethylbenzene (HMB) and pentamethylbenzene-1-sulfonic acid (PeMB-1-S) as reagents in 95.5 and 98.4% H2SO4 as solvent has been studied under homogeneous conditions. HMB effects methylation of 2,4,6-trimethylbenzene-1-sulfonic acid (2,4,6-TrMB-1-S), 2,3,4,6-tetramethylbenzene-1-sulfonic acid (2,3,4,6-TeMB-1-S), and 2,3,5,6-TeMB-1-S, but not of the sulfonic acids of 1,3-dimethylbenzene (1,3-DMB), 1,2,3-TrMB, 1,2,4-TrMB, and 1,2,3,4-TeMB. PeMB-1-S is less reactive as methylating reagent than HMB. The observed substrate reactivity towards methylation by HMB was observed to decrease in the order [Formula: see text], and towards methylation by PeMB-1-S to decrease in the order [Formula: see text]. On the basis of a comparison of these orders of substrate reactivities with those predicted for the series of the PoMB-1-sulfonates and the corresponding PoMB's, it is concluded that the substrate species undergoing methylation are the PoMB's and not the corresponding sulfonates.

The Preparation of 1,2-Bis(2,2′:6′,2′′-Terpyridin-4′yl)Ethanone: The First Example of 4′-Terpyridyls Unsymmetrically Linked by a Functionalized Two-Carbon Chain

2004 ◽  
Vol 57 (7) ◽  
pp. 689 ◽  
Author(s):  
Zhi-Long Chen ◽  
Ronald N. Warrener ◽  
Douglas N. Butler
Keyword(s):  
Sulfuric Acid ◽  
Hydrochloric Acid ◽  
Single Crystal ◽  
Coupling Reaction ◽  
Carbon Chain ◽  
Sodium Cyanide ◽  
Starting Material ◽  
X Ray ◽  
Concentrated Sulfuric Acid ◽  
Single Crystal Analysis

1,2-Bis(2,2′:6′,2′′-terpyridin-4′yl)ethanone 7, an unsymmetrically linked bis-tridentatate ligand, was prepared by treatment of 4′-cyanomethylterpyridine 10 (RT, overnight) or 4′-(methoxycarbonylmethyl)terpyridine 11 (60°C, 7 h) with concentrated hydrochloric acid. These conversions, which involved an unprecedented homo-coupling reaction, are discussed with the structure of 7 being confirmed by X-ray single crystal analysis. The nitrile starting material 10 was prepared by reaction of the mesylate 9, derived from the known 4′-hydroxymethylterpyridine 8 with sodium cyanide, while ester 11 was prepared by reaction of 10 with methanol in the presence of concentrated sulfuric acid.

Mechanism of Sulfonation of 4-Hydroxyazobenzene

1971 ◽  
Vol 49 (1) ◽  
pp. 152-156 ◽  
Author(s):  
E. Buncel ◽  
W. M. J. Strachan ◽  
H. Cerfontain
Keyword(s):  
Sulfuric Acid ◽  
Complex Formation ◽  
Sulfonic Acid ◽  
Acid Media ◽  
Proton Abstraction ◽  
Rate Determining Step ◽  
Concentrated Sulfuric Acid

The mechanism of sulfonation of 4-hydroxyazobenzene and of 4-hydroxyazobenzene-4′-sulfonic acid in concentrated sulfuric acid media is examined through rate correlations and comparison is drawn with sulfonation of alkyl- and halogenobenzenes by means of [Formula: see text] plots. It is concluded that several mechanisms are operative in the hydroxyazobenzene system and that the curvature of the plot is the result of a change in rate-determining step from σ-complex formation to proton abstraction.

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