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

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

Measurement of p-Toluenesulfonic Acid-Catalyzed Reaction Kinetics of 1,2-Propylene Glycol Acetylation Using In Situ1H NMR Spectroscopy

2013 ◽  
Vol 52 (27) ◽  
pp. 9337-9342 ◽  
Author(s):  
Arati Santhanakrishnan ◽  
Lars Peereboom ◽  
Dennis J. Miller ◽  
Adina Dumitrascu ◽  
Patrick B. Smith
Keyword(s):  
Nmr Spectroscopy ◽  
Reaction Kinetics ◽  
Propylene Glycol ◽  
Toluenesulfonic Acid ◽  
Acid Catalyzed ◽  
Kinetics Of

Practical Asymmetric Synthesis of Aprepitant (I), a Potent Human NK-1 Receptor Antagonist, via a Stereoselective Lewis Acid Catalyzed trans Acetalization Reaction.

ChemInform ◽  
2003 ◽  
Vol 34 (7) ◽  
Author(s):  
Matthew 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

scholarly journals Selective Hierarchical Aluminosilicates for Acetalization Reaction with Propylene Glycol

2019 ◽  
Vol 19 (4) ◽  
pp. 975 ◽  
Author(s):  
Hartati Hartati ◽  
Mardi Santoso ◽  
Hadi Nur ◽  
Leaw Wai Loon ◽  
Hasliza Bahruji ◽  
...  
Keyword(s):  
Propylene Glycol ◽  
High Selectivity ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Acid Sites ◽  
Mesoporous Aluminosilicates ◽  
Adsorption Analysis ◽  
The Hierarchical Structure ◽  
Acetalization Reaction

Hierarchical micro-mesoporous aluminosilicates nanoparticles were synthesized at different of Si/Al ratios and were directly used as a solid acid catalyst for acetalization reaction with propylene glycol. TEM and N2 adsorption analysis of the resulting aluminosilicates revealed the formation of the hierarchical structure occurs on the Si/Al ratio increases the formation of mesoporous within the structure of aluminosilicate. The aluminosilicates exhibit high selectivity towards acetalization reaction in comparison with the homogeneous PTSA. The presence of mesoporous structures is crucial for increased conversion and selectivity of the reaction which presumably due to the improved diffusion of substrate to reach acid sites.

Acid Catalyzed Furan Ring Transposition

10.1039/sp768 ◽  
2014 ◽  
Author(s):  
Jamsheena V. ◽  
Ravindra Phatake
Keyword(s):  
Furan Ring ◽  
Acid Catalyzed

Molecular dynamics of poly(propylene) glycol in nanometer confinements

2000 ◽  
Vol 10 (PR7) ◽  
pp. Pr7-271-Pr7-274 ◽  
Author(s):  
A. Schönhals ◽  
H. Goering ◽  
K.-W. Brzezinka ◽  
Ch. Schick
Keyword(s):  
Molecular Dynamics ◽  
Propylene Glycol ◽  
Poly Propylene

Hydrogenolysis of glucose and fructose in glycol solutions over CuO-MgO-ZrO2 catalyst

2020 ◽  
pp. 48-55
Author(s):  
M.E. Sharanda ◽  
◽  
E.A. Bondarenko ◽  
Keyword(s):  
Ethylene Glycol ◽  
Propylene Glycol ◽  
Flow Reactor ◽  
General Trend ◽  
Raw Materials ◽  
Reaction Products ◽  
Renewable Raw Materials ◽  
High Partial Pressure ◽  
Zro2 Catalyst ◽  
Phase Process

Ethylene glycol and propylene glycol are important representatives of polyols. On an industrial scale, they are obtained from petrochemical raw materials. Within a decade, significant efforts were made for the producing of polyols from biologically renewable raw materials - carbohydrates. The general trend for carbohydrate hydrogenolysis includes application of liquid-phase process with the use of modified metal-oxide catalysts, at 120-120 ° C and pressure of 3MPa or above. So high pressure is used for the reason to increase hydrogen solubility, and also due to the high partial pressure of low boiling solvents. We supposed that usage of high boiling solvents could allow hydrogenolysis to be performed at the lower pressure. Ethylene glycol and propylene glycol are of particular interest as such kind of solvent since they are both the main products of glucose hydrogenolysis. In this work, the process of hydrogenolysis of glucose and fructose over Cu / MgO-ZrO2 catalyst have been studied at temperature range of 160-200 °C and a pressure of 0.1-0.3 MPa in a flow reactor. The solvents were simultaneously the target products of the reaction - ethylene glycol and / or propylene glycol. Gas chromatography and 13C NMR were used for the reaction products identification. It was found that the solubility of glucose in propylene glycol is 21 % by weight, and in ethylene glycol 62% by weight. It was pointed out that the process of hydrogenolysis can take place at a pressure close to atmospheric. Under these conditions, the conversion of hexoses reaches 96-100 %. The reaction products are preferably propylene glycol and ethylene glycol. The total selectivity for C3-2 polyols is 90-94 %, that is higher than in the hydrogenolysis of glucose in aqueous solution.

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