Mesoporous Zr-Beta zeolites prepared by a post-synthetic strategy as a robust Lewis acid catalyst for the ring-opening aminolysis of epoxides

2015 ◽  
Vol 17 (3) ◽  
pp. 1744-1755 ◽  
Author(s):  
Bo Tang ◽  
Weili Dai ◽  
Xiaoming Sun ◽  
Guangjun Wu ◽  
Naijia Guan ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Catalytic Activity ◽  
Lewis Acid ◽  
Ring Opening ◽  
Acid Catalyst ◽  
Amino Alcohols ◽  
Synthetic Strategy ◽  
Beta Zeolites ◽  
Lewis Acid Catalyst ◽  
Catalytic Deactivation

Mesoporous Zr-Beta exhibits a remarkable catalytic activity and regio-selectivity to β-amino alcohols in epoxide aminolysis. Intra-crystalline mesopores greatly promote the reaction through enhanced mass transfer and suppress the catalytic deactivation.

scholarly journals Anhydrous Titanium(III) chloride as a New Lewis-Acid Catalyst for Ring Opening of Epoxides with Aromatic Amines

2007 ◽  
Vol 2 (2) ◽  
pp. 1934578X0700200
Author(s):  
Suchitra Bhatt ◽  
Sandip K. Nayak
Keyword(s):  
Ambient Temperature ◽  
Lewis Acid ◽  
Aromatic Amines ◽  
Ring Opening ◽  
Acid Catalyst ◽  
Amino Alcohols ◽  
Azide Ion ◽  
Ring Opening Of Epoxides ◽  
Lewis Acid Catalyst

Anhydrous titanium(III) chloride was found to be a simple and efficient Lewis acid catalyst for ring opening of epoxides at ambient temperature. The reaction proceeded smoothly with anilines as well as azide ion as nucleophiles to give the corresponding β-amino alcohols and β-azido alcohols in moderate to good yields.

Lewis acid catalyst-steered divergent synthesis of functionalized vicinal amino alcohols and pyrroles from tertiary enamides

2018 ◽  
Vol 5 (21) ◽  
pp. 3138-3142 ◽  
Author(s):  
Xin-Ming Xu ◽  
Chuan-Hu Lei ◽  
Shuo Tong ◽  
Jieping Zhu ◽  
Mei-Xiang Wang
Keyword(s):  
Lewis Acid ◽  
Acid Catalyst ◽  
Amino Alcohols ◽  
Reaction Pathways ◽  
Lewis Acid Catalyst

We report herein two Lewis acid catalyst-steered distinct reaction pathways of N-formylmethyl tertiary enamides.

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.

scholarly journals Highly efficient Lewis acid catalytic art of tritylium ion at the node of tensile organic framework

2021 ◽  
Author(s):  
Shuai Zhao ◽  
Juhui Zhang ◽  
Yongchang Zhai ◽  
Xiaoqin Zou ◽  
Shaolei Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Organic Synthesis ◽  
Lewis Acid ◽  
Acid Catalyst ◽  
Highly Efficient ◽  
Long Time ◽  
Lewis Acid Catalyst ◽  
Organic Framework

Tritylium salts have been used as Lewis acid catalyst in organic synthesis for a long time. In this work, we found that the Lewis acid catalytic activity of tritylium ions...

scholarly journals Catalytic, Transannular Carbonyl-Olefin Metathesis Reactions

2019 ◽  
Author(s):  
Paul Riehl ◽  
Daniel Nasrallah ◽  
Corinna Schindler
Keyword(s):  
Lewis Acid ◽  
Olefin Metathesis ◽  
Ring Opening ◽  
Acid Catalyst ◽  
Catalyst Design ◽  
Lewis Acid Catalysts ◽  
Complex Molecules ◽  
New Class ◽  
Metathesis Reactions ◽  
Lewis Acid Catalyst

A new class of Lewis acid-catalyzed carbonyl-olefin metathesis reactions is described that complements existing protocols for related ring-closing, ring-opening, and intermolecular transformations. These transannular carbonyl-olefin metathesis reactions rely on FeCl<sub>3</sub> as an inexpensive Lewis acid catalyst and are mechanistically distinct from previously developed protocols for ring closing, ring-opening and intermolecular metathesis. Specifically, carbonyl-ene and carbonyl-olefin metathesis reaction paths are competing to ultimately favor metathesis as the thermodynamic product. Importantly, we show that distinct Lewis acid catalysts are able to differentiate between these pathways to enable the selective formation of transannular carbonyl-ene or carbonyl-olefin metathesis products thus providing a valuable approach to the molecular editing of naturally occurring complex molecules. Additionally, these results are expected to enable further advances in catalyst design for carbonyl-olefin metathesis to ultimately develop efficient and high-yielding catalytic carbonyl olefination reactions.

scholarly journals Gallium-containing polymer brush film as efficient supported Lewis acid catalyst in a glass microreactor

2013 ◽  
Vol 9 ◽  
pp. 1698-1704 ◽  
Author(s):  
Rajesh Munirathinam ◽  
Roberto Ricciardi ◽  
Richard J M Egberink ◽  
Jurriaan Huskens ◽  
Michael Holtkamp ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Lewis Acid ◽  
Photoelectron Spectroscopy ◽  
Polymer Brushes ◽  
Silicon Oxide ◽  
Polymer Brush ◽  
Acid Catalyst ◽  
Ring Closure ◽  
Oxide Surface ◽  
Lewis Acid Catalyst

Polystyrene sulfonate polymer brushes, grown on the interior of the microchannels in a microreactor, have been used for the anchoring of gallium as a Lewis acid catalyst. Initially, gallium-containing polymer brushes were grown on a flat silicon oxide surface and were characterized by FTIR, ellipsometry, and X-ray photoelectron spectroscopy (XPS). XPS revealed the presence of one gallium per 2–3 styrene sulfonate groups of the polymer brushes. The catalytic activity of the Lewis acid-functionalized brushes in a microreactor was demonstrated for the dehydration of oximes, using cinnamaldehyde oxime as a model substrate, and for the formation of oxazoles by ring closure of ortho-hydroxy oximes. The catalytic activity of the microreactor could be maintained by periodic reactivation by treatment with GaCl3.

Enhanced catalytic activity of a hierarchical porous metal–organic framework CuBTC

CrystEngComm ◽  
2015 ◽  
Vol 17 (37) ◽  
pp. 7124-7129 ◽  
Author(s):  
Zhigang Hu ◽  
Yongwu Peng ◽  
Kai Min Tan ◽  
Dan Zhao
Keyword(s):  
Catalytic Activity ◽  
Pore Size ◽  
Lewis Acid ◽  
Metal Organic Framework ◽  
Porous Metal ◽  
Acid Catalyst ◽  
Hierarchical Porous ◽  
Metal Organic ◽  
Lewis Acid Catalyst ◽  
Organic Framework

A hierarchical porous metal–organic framework CuBTC with mesopores of 3.9 nm pore size has been facilely obtained as Lewis acid catalyst.

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