ChemInform Abstract: Proline-Mediated Enantioselective Construction of Tetrahydropyrans via a Domino Aldol/Acetalization Reaction.

ChemInform ◽  
2008 ◽  
Vol 39 (35) ◽  
Author(s):  
Damien Hazelard ◽  
Hayato Ishikawa ◽  
Daisuke Hashizume ◽  
Hiroyuki Koshino ◽  
Yujiro Hayashi
Keyword(s):  
Acetalization Reaction

Cobalt oxide promoted tin oxide catalysts for highly selective glycerol acetalization reaction

2021 ◽  
Vol 128 ◽  
pp. 108578
Author(s):  
Semakaleng Bewana ◽  
Matumuene Joe Ndolomingo ◽  
Reinout Meijboom ◽  
Ndzondelelo Bingwa
Keyword(s):  
Cobalt Oxide ◽  
Tin Oxide ◽  
Oxide Catalysts ◽  
Acetalization Reaction

A green approach for the preparation of a surfactant embedded sulfonated carbon catalyst towards glycerol acetalization reactions

2020 ◽  
Vol 10 (14) ◽  
pp. 4827-4844 ◽  
Author(s):  
Anindya Ghosh ◽  
Aniruddha Singha ◽  
Aline Auroux ◽  
Avik Das ◽  
Debasis Sen ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Acid Catalyst ◽  
Acidic Site ◽  
Carbon Catalyst ◽  
Green Approach ◽  
Site Density ◽  
Physical Mixing ◽  
Acetalization Reaction ◽  
The Relationship ◽  
Carbon Based

A surfactant embedded carbon-based acid catalyst was prepared via simple physical mixing and thermal treatment to establish the relationship between hydrophobicity and acidic site density for efficient glycerol acetalization reaction.

Acetalization reaction between glycerol and n-butyraldehyde using an acidic ion exchange resin. Kinetic modelling

2013 ◽  
Vol 228 ◽  
pp. 300-307 ◽  
Author(s):  
M. Belen Güemez ◽  
Jesus Requies ◽  
Ion Agirre ◽  
Pedro L. Arias ◽  
V. Laura Barrio ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Kinetic Modelling ◽  
Ion Exchange Resin ◽  
Acetalization Reaction

scholarly journals The Nature of Acid-Catalyzed Acetalization Reaction of 1,2-Propylene Glycol and Acetaldehyde

2015 ◽  
Vol 53 (4) ◽  
pp. 463-467
Author(s):  
Chen Cheng ◽  
Hui Chen ◽  
Xia Li ◽  
Jianli Hu ◽  
Baochen Liang
Keyword(s):  
Propylene Glycol ◽  
Acid Catalyzed ◽  
Acetalization Reaction

Synthesis Strategy of Hierarchical Alumiosilicates from Low Grade Indonesian Kaolin with Adjusted Activity in Acetalization Reaction

2020 ◽  
Vol 840 ◽  
pp. 526-534
Author(s):  
Hartati Hartati ◽  
Tjitjik Srie Tjahjandarie ◽  
Aning Purwaningsih ◽  
Susana Murti ◽  
Nastiti Mustika Rizki Ikhtiarsih ◽  
...  
Keyword(s):  
Catalyst Activity ◽  
Acid Catalyst ◽  
Ammonium Hydroxide ◽  
Hydrothermal Condition ◽  
Low Grade ◽  
Basic Solution ◽  
X Ray Diffraction ◽  
Synthesis Strategy ◽  
Ftir Spectrometry ◽  
Acetalization Reaction

Synthesis strategy of hierarchical aluminosilicates was carried out by varying the starting material, type of a basic solution, and the hydrothermal condition. Aluminosilicate was synthesized using pre-treated low-quality kaolin by three kinds of basic solution, such as sodium hydroxide, sodium fluoride, and tetrapropyl ammonium hydroxide. The hydrothermal condition was carried out by gradual temperature and constant temperature. The desired mole ratio of Si/Al achieved by dealumination or by addition of silica. Products were characterized by X-ray diffraction, FTIR spectrometry, and nitrogen physisorption. Cation exchange was carried out on the product to obtain an acid catalyst. The acidity test of the catalyst was carried out by FTIR-pyridine spectrometry. The catalyst activity test was carried out to the acetalization reaction of 3,4-dimethoxybenzaldehyde with propylene glycol. The results showed that the catalyst synthesized with the basic solution of tetrapropyl ammonium hydroxide had the highest acid site number and the highest conversion of 3,4-dimethoxybenzaldehyde to acetal.

Novel Route for Recovery of Glycerol from Aqueous Solutions by Reversible Reactions

2009 ◽  
Vol 7 (1) ◽  
Author(s):  
Vijaya lakshmi Ch ◽  
Udaybhaskar Ravuru ◽  
Viswanath Kotra ◽  
Satyavathi Bankupalli ◽  
Prasad R.B.N.
Keyword(s):  
Aqueous Solutions ◽  
Extraction Efficiency ◽  
Equilibrium Constants ◽  
Complete Recovery ◽  
Reactive Extraction ◽  
Maximum Efficiency ◽  
Reported Study ◽  
Acetalization Reaction ◽  
Hydrolysis Of ◽  
Acetone System

Glycerol in aqueous solutions was reacted with acetaldehyde and acetone to form glycerol acetals. The formed acetal was extracted using a solvent and the glycerol is recovered by hydrolysis of the extractant. The reaction equilibrium constants ranged from 1-35 for glycerol-acetaldehyde system and 2.2-5.5 for glycerol-acetone system, respectively. Phase equilibrium measurements showed that the distribution coefficient was from 1.5-8.5 for glycerol-acetaldehyde system and 2-6.5 for glycerol-acetone system. The extraction efficiency of the solvent increased with increase in temperature. Maximum efficiency achieved was 94% at the refluxing temperature of toluene. The reactive extraction route to obtain glycerol is more economical than the distillation route in pure form. The maximum conversion obtained during the acetalization reaction was 87% and the extraction efficiency achieved was 94%. The hydrolysis of the acetal recorded complete recovery of high purity glycerol. The reported study has an application for the recovery of pure glycerol from aqueous solutions generated during biodiesel processing.

Synthesis of sulfonic acid-functionalized Fe3O4@C nanoparticles as magnetically recyclable solid acid catalysts for acetalization reaction

2014 ◽  
Vol 43 (3) ◽  
pp. 1220-1227 ◽  
Author(s):  
Fang-Cai Zheng ◽  
Qian-Wang Chen ◽  
Lin Hu ◽  
Nan Yan ◽  
Xiang-Kai Kong
Keyword(s):  
Sulfonic Acid ◽  
Solid Acid ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Acetalization Reaction

Practical Asymmetric Synthesis of Aprepitant, a Potent Human NK-1 Receptor Antagonist, via a Stereoselective Lewis Acid-Catalyzed Trans Acetalization Reaction

2002 ◽  
Vol 67 (19) ◽  
pp. 6743-6747 ◽  
Author(s):  
Matthew M. Zhao ◽  
James M. McNamara ◽  
Guo-Jie Ho ◽  
Khateeta M. Emerson ◽  
Zhiguo J. Song ◽  
...  
Keyword(s):  
Receptor Antagonist ◽  
Asymmetric Synthesis ◽  
Lewis Acid ◽  
Acid Catalyzed ◽  
Acetalization Reaction
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