Composite Polyether Electrolytes with Lewis Acid Type Additives

1998 ◽  
Vol 102 (2) ◽  
pp. 352-360 ◽  
Author(s):  
W. Wieczorek ◽  
A. Zalewska ◽  
D. Raducha ◽  
Z. Florjańczyk ◽  
J. R. Stevens
Keyword(s):  
Lewis Acid ◽  
Acid Type

scholarly journals Dichlorodioxomolybdenum(VI) Complexes: Useful and Readily Available Catalysts in Organic Synthesis

Synthesis ◽  
2018 ◽  
Vol 50 (20) ◽  
pp. 4019-4036 ◽  
Author(s):  
Roberto Sanz ◽  
Raquel Hernández-Ruiz
Keyword(s):  
Transition Metal Complexes ◽  
Lewis Acid ◽  
Short Review ◽  
Lewis Base ◽  
Phosphorus Compounds ◽  
Oxidation Reactions ◽  
Organic Transformations ◽  
Reduction Reactions ◽  
Acid Type ◽  
Catalyzed Reactions

Molybdenum(VI) dichloride dioxide (MoO2Cl2), and its addition complexes [MoO2Cl2(L)n; L = neutral ligand], are commercially or easily available and inexpensive transition-metal complexes based on a non-noble metal that can be applied as catalysts for various organic transformations. This short review aims to present the most significant breakthroughs in this field.1 Introduction2 Preparation and Reactivity of MoO2Cl2(L)n Complexes2.1 Synthesis and Structure2.2 Reactivity of Dichlorodioxomolybdenum(VI) Complexes3 Redox Processes Catalyzed by MoO2Cl2(L)n Complexes3.1 Deoxygenation Reactions Using Phosphorus Compounds3.2 Deoxygenation and Hydrosilylation Reactions Using Silanes3.3 Reduction Reactions Using Hydrogen3.4 Deoxygenation Reactions with Boranes and Thiols3.5 Reduction Reactions with Glycols3.6 Oxidation Reactions4 Ambiphilic Reactivity of MoO2Cl2 4.1 Amphoteric Lewis Acid–Lewis Base Catalyzed Reactions4.2 Lewis Acid Type Catalyzed Reactions5 Conclusion and Perspective

Comparison study of lewis acid type catalysts on the esterification of octanoic acid and n-octyl alcohol

1996 ◽  
Vol 19 (6) ◽  
pp. 538-542 ◽  
Author(s):  
Ana María Bahamonde Santos ◽  
Mercedes Martínez ◽  
José Aracil Mira
Keyword(s):  
Lewis Acid ◽  
Octanoic Acid ◽  
Comparison Study ◽  
Acid Type

The effect of additive of Lewis acid type on lithium–gel electrolyte characteristics

2011 ◽  
Vol 57 ◽  
pp. 58-65 ◽  
Author(s):  
Kamil Perzyna ◽  
Regina Borkowska ◽  
Jarosław Syzdek ◽  
Aldona Zalewska ◽  
Władysław Wieczorek
Keyword(s):  
Lewis Acid ◽  
Gel Electrolyte ◽  
Acid Type ◽  
Electrolyte Characteristics

Influence of Preparation Conditions on the Acidity of WO3/ZrO2 Solid Superacid

2011 ◽  
Vol 233-235 ◽  
pp. 1502-1506 ◽  
Author(s):  
Ping Xu ◽  
Min Wei Wang ◽  
Jia Wei Qu ◽  
Ren Lang Wang ◽  
Jian Wang
Keyword(s):  
Lewis Acid ◽  
Acid Sites ◽  
Acid Strength ◽  
Lewis Acid Sites ◽  
Solid Superacid ◽  
Preparation Conditions ◽  
Acid Type ◽  
Loading Amount ◽  
Superacid Catalysts ◽  
Adsorption Desorption

WO3/ZrO2 solid superacid catalysts were prepared by coprecipitation and impregnation, then were characterized by XRD, N2 adsorption-desorption, Hammett indicator and pyridine chemisorption IR. The acid strength, acid type, acid volume, etc were compared under the different preparation conditions. The results indicated that the catalyst prepared by coprecipitation had stronger acid strength than the catalyst prepared by impregnation. The samples prepared by impregnation had more Lewis acid sites. With the increasing of the W/Zr ratio, the acid strength tended to increase at first and then decrease, and the catalyst with 10% WO3 loading amount had the strongest acidity. The higher the calcination temperature, the less the Lewis acid sites.

scholarly journals Synthesis of environmentally friendly, efficient and highly recyclable Lewis acid-type calix[4]arene catalysts containing flexible or bulky groups for the Mannich reaction

RSC Advances ◽  
2017 ◽  
Vol 7 (18) ◽  
pp. 10748-10756 ◽  
Author(s):  
Serkan Sayin ◽  
Mustafa Yilmaz
Keyword(s):  
Lewis Acid ◽  
Mannich Reaction ◽  
Environmentally Friendly ◽  
Acid Type ◽  
The Mannich Reaction

Two new calix[4]arene-based Lewis acid-type catalysts containing flexible and bulky groups (2 and 3) were successfully synthesized.

Composite polyether electrolytes with Lewis acid type additives

2001 ◽  
Vol 46 (10-11) ◽  
pp. 1737-1746 ◽  
Author(s):  
R Borkowska ◽  
A Reda ◽  
A Zalewska ◽  
W Wieczorek
Keyword(s):  
Lewis Acid ◽  
Acid Type

ChemInform Abstract: Alkylation of Partially Protected Xylofuranoses and Tetritols with (2,2,3,3,4,4,5,5,6,6,7,7,7-Tridecafluoroheptyl)oxirane and the Stability of Protecting Acetal Groups Towards Lewis Acid-Type Catalyst.

ChemInform ◽  
2010 ◽  
Vol 33 (26) ◽  
pp. no-no
Author(s):  
Karel Kefurt ◽  
Jitka Moravcova ◽  
Sarka Bambasova ◽  
Katerina Buchalova ◽  
Barbora Vymetalikova ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Acid Type ◽  
The Stability

Alkylation of Partially Protected Xylofuranoses and Tetritols with (2,2,3,3,4,4,5,5,6,6,7,7,7-Tridecafluoroheptyl)oxirane and the Stability of Protecting Acetal Groups Towards Lewis Acid-Type Catalyst

2001 ◽  
Vol 66 (11) ◽  
pp. 1665-1681 ◽  
Author(s):  
Karel Kefurt ◽  
Jitka Moravcová ◽  
Šárka Bambasová ◽  
Kateřina Buchalová ◽  
Barbora Vymětalíková ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Boron Trifluoride ◽  
Catalytic Amount ◽  
Boron Trifluoride Diethyl Etherate ◽  
Acid Type ◽  
The Stability

1,2-O-Isopropylidene-3-O-methyl-α-D-xylofuranose (2), 1,2-O-isopropylidene-α-D-xylofuranose (3), 2,4-O-ethylidene-D-erythritol (4) and 1,3-O-ethylidene-D-threitol (5) were alkylated with racemic (2,2,3,3,4,4,5,5,6,6,7,7,7-tridecafluoroheptyl)oxirane (1) using boron trifluoride diethyl etherate as a catalyst. The desired mono- or disubstituted polyfluoroalkyl derivatives 6-11 were isolated only in low to medium yields. The fluoroalkylation was accompanied with disproportional distributions of the protecting acetal/ketal groups and polymerization of saccharides. Therefore the stability of 3, 4, 5, 5-O-acetyl-1,2-O-isopropylidene-α-D-xylofuranose (14) and 1,2-O-isopropylidene-α-D-glucofuranose (15) in the presence of a catalytic amount of boron trifluoride diethyl etherate was investigated in various solvents. A mechanism explaining the effect of the catalyst has been proposed.

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