Catalytic activity of systems Lewis acid-Broensted acid in disproportionation, isomerization and alkylation reactions

1977 ◽  
Vol 42 (10) ◽  
pp. 2832-2844
Author(s):  
K. Mach ◽  
V. Patzelová ◽  
E. Drahorádová ◽  
J. Zelinka
Keyword(s):  
Catalytic Activity ◽  
Lewis Acid ◽  
Alkylation Reactions

Lewis Acid-Promoted Suzuki Reaction using Palladium Chloride Anchored on a Polymer as a Catalyst

2008 ◽  
Vol 61 (8) ◽  
pp. 610 ◽  
Author(s):  
Guozhi Fan ◽  
Hanjun Zhang ◽  
Siqing Cheng ◽  
Zhandong Ren ◽  
Zhijun Hu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Lewis Acid ◽  
Lewis Acids ◽  
Heterogeneous Catalysts ◽  
Suzuki Reaction ◽  
Cross Coupling ◽  
Palladium Chloride ◽  
Coupling Reactions ◽  
Cross Coupling Reactions ◽  
Recoverable Catalyst

Palladium chloride anchored on polystyrene modified by 5-amino-1,10-phenanthroline was prepared and used as an efficient recoverable catalyst for Suzuki cross-coupling reactions. The heterogeneous catalysts can be easily separated from the reaction mixture and reused for five cycles without significant Pd leaching and loss of catalytic activity. Rate enhancement in the Suzuki reaction by Lewis acids was also studied.

Hydrazone-based covalent organic frameworks for Lewis acid catalysis

2018 ◽  
Vol 47 (39) ◽  
pp. 13824-13829 ◽  
Author(s):  
Tanay Kundu ◽  
Jian Wang ◽  
Youdong Cheng ◽  
Yonghua Du ◽  
Yuhong Qian ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Lewis Acid ◽  
Acid Catalysis ◽  
Covalent Organic Frameworks ◽  
Lewis Acid Catalysis

Two new hydroxy-rich hydrazone COFs are synthesized and postsynthetically incorporated with CoII to exhibit Lewis acid catalytic activity in cyanosilylation reactions of various aldehydes.

Catalytic dehydrofluorination of 1,1,1,2-tetrafluoroethane to synthesize trifluoroethylene over a modified NiO/Al2O3 catalyst

2015 ◽  
Vol 5 (6) ◽  
pp. 3103-3107 ◽  
Author(s):  
Wenzhi Jia ◽  
Min Liu ◽  
Xuewei Lang ◽  
Chao Hu ◽  
Junhui Li ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Linear Relationship ◽  
Lewis Acid ◽  
Acid Sites ◽  
Lewis Acid Sites ◽  
Al2o3 Catalyst

The close linear relationship between Lewis acid sites and catalytic activity for the dehydrofluorination of CF3CFH2.

scholarly journals Lewis acid enhancement by hydrogen-bond donors for asymmetric catalysis

Science ◽  
2017 ◽  
Vol 358 (6364) ◽  
pp. 761-764 ◽  
Author(s):  
Steven M. Banik ◽  
Anna Levina ◽  
Alan M. Hyde ◽  
Eric N. Jacobsen
Keyword(s):  
Hydrogen Bond ◽  
Catalytic Activity ◽  
Asymmetric Catalysis ◽  
Small Molecule ◽  
Lewis Acid ◽  
Low Temperatures ◽  
Noncovalent Interactions ◽  
Enantioselective Reactions ◽  
Acidic Complex ◽  
Hydrogen Bond Donors

Small-molecule dual hydrogen-bond (H-bond) donors such as ureas, thioureas, squaramides, and guanidinium ions enjoy widespread use as effective catalysts for promoting a variety of enantioselective reactions. However, these catalysts are only weakly acidic and therefore require highly reactive electrophilic substrates to be effective. We introduce here a mode of catalytic activity with chiral H-bond donors that enables enantioselective reactions of relatively unreactive electrophiles. Squaramides are shown to interact with silyl triflates by binding the triflate counterion to form a stable, yet highly Lewis acidic, complex. The silyl triflate-chiral squaramide combination promotes the generation of oxocarbenium intermediates from acetal substrates at low temperatures. Enantioselectivity in nucleophile additions to the cationic intermediates is then controlled through a network of noncovalent interactions between the squaramide catalyst and the oxocarbenium triflate.

Post-synthetic metalation in an anionic MOF for efficient catalytic activity and removal of heavy metal ions from aqueous solution

2016 ◽  
Vol 52 (13) ◽  
pp. 2831-2834 ◽  
Author(s):  
Anindita Chakraborty ◽  
Sohini Bhattacharyya ◽  
Arpan Hazra ◽  
Ashta Chandra Ghosh ◽  
Tapas Kumar Maji
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Catalytic Activity ◽  
Metal Ions ◽  
Lewis Acid ◽  
Heavy Metal Ions ◽  
Toxic Metal ◽  
Acid Catalyst ◽  
Toxic Metal Ions ◽  
Lewis Acid Catalyst

An anionic MOF shows the potential to capture toxic metal ions from water and the CuII@AMOF hybrid obtained through post-synthetic metalation is used as a Lewis acid catalyst.

An efficient combination of Zr-MOF and microwave irradiation in catalytic Lewis acid Friedel–Crafts benzoylation

2016 ◽  
Vol 45 (18) ◽  
pp. 7875-7880 ◽  
Author(s):  
Tan L. H. Doan ◽  
Thong Q. Dao ◽  
Hai N. Tran ◽  
Phuong H. Tran ◽  
Thach N. Le
Keyword(s):  
Catalytic Activity ◽  
Microwave Irradiation ◽  
Lewis Acid ◽  
Metal Organic Framework ◽  
Metal Organic ◽  
Highly Porous ◽  
Organic Framework

The catalytic activity of a highly porous and stable zirconium-based metal–organic framework in the benzoylation reaction was enhanced by microwave irradiation.

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