Structure modulation in zinc–ditetrazolate coordination polymers by in situ ligand synthesis

RSC Advances ◽  
2015 ◽  
Vol 5 (108) ◽  
pp. 88809-88815 ◽  
Author(s):  
Yun-Wu Li ◽  
Hui-Yan Ma ◽  
Su-Na Wang ◽  
Jian Xu ◽  
Da-Cheng Li ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Coordination Polymers ◽  
Cycloaddition Reaction ◽  
Acid Catalysts ◽  
Synthesis System ◽  
Lewis Acid Catalysts ◽  
Structure Modulation ◽  
Ligand Synthesis

Three new coordination polymers have been constructed by an in situ ditetrazolate-ligand synthesis system involving the sharpless [2 + 3] cycloaddition reaction between IPN and NaN3 in the presence of Zn2+ ions as Lewis-acid catalysts.

A DFT study of the role of the Lewis acid catalysts in the [3 + 2] cycloaddition reaction of the electrophilic nitrone isomer of methyl glyoxylate oxime with nucleophilic cyclopentene

RSC Advances ◽  
2015 ◽  
Vol 5 (79) ◽  
pp. 64098-64105 ◽  
Author(s):  
Abdelmalek Khorief Nacereddine ◽  
Hatem Layeb ◽  
Fouad Chafaa ◽  
Wassila Yahia ◽  
Abdelhafid Djerourou ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Cycloaddition Reaction ◽  
Dft Study ◽  
Acid Catalysts ◽  
Lewis Acid Catalysts ◽  
Computational Level

The mechanism and stereoselectivity of the BH3-catalysed 32CA reaction between C-methoxycarbonyl nitrone and cyclopentene has been studied using MPWB1K/6-31G(d) computational level.

Catalytic Carbonyl-Olefin Metathesis of Aliphatic Ketones: Iron(III) HomoDimers as Lewis Acidic Superelectrophiles

2018 ◽  
Author(s):  
Haley Albright ◽  
Paul S. Riehl ◽  
Christopher C. McAtee ◽  
Jolene P. Reid ◽  
Jacob R. Ludwig ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Olefin Metathesis ◽  
Acid Activation ◽  
Lewis Acid Catalysts ◽  
Distinct Mode ◽  
Aliphatic Ketones ◽  
Carbon Carbon Bond ◽  
Metathesis Reactions ◽  
Acid Catalyzed

<div>Catalytic carbonyl-olefin metathesis reactions have recently been developed as a powerful tool for carbon-carbon bond</div><div>formation. However, currently available synthetic protocols rely exclusively on aryl ketone substrates while the corresponding aliphatic analogs remain elusive. We herein report the development of Lewis acid-catalyzed carbonyl-olefin ring-closing metathesis reactions for aliphatic ketones. Mechanistic investigations are consistent with a distinct mode of activation relying on the in situ formation of a homobimetallic singly-bridged iron(III)-dimer as the active catalytic species. These “superelectrophiles” function as more powerful Lewis acid catalysts that form upon association of individual iron(III)-monomers. While this mode of Lewis acid activation has previously been postulated to exist, it has not yet been applied in a catalytic setting. The insights presented are expected to enable further advancement in Lewis acid catalysis by building upon the activation principle of “superelectrophiles” and broaden the current scope of catalytic carbonyl-olefin metathesis reactions.</div>

Hydrothermal synthesis of Sn-Beta zeolites in F−-free medium

2018 ◽  
Vol 5 (11) ◽  
pp. 2763-2771 ◽  
Author(s):  
Hao Xu ◽  
Xudong Wang ◽  
Peng Ji ◽  
Haihong Wu ◽  
Yejun Guan ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Lewis Acid ◽  
Crystal Size ◽  
Acid Catalysts ◽  
Free Medium ◽  
Lewis Acid Catalysts ◽  
Structure Directing Agent ◽  
Highly Active ◽  
Beta Zeolites

Sn-Beta zeolites, with high Sn content and smaller crystal size, hydrothermally synthesized in F−-free medium using N-cyclohexyl-N,N-dimethylcyclohexanaminium hydroxide as the structure-directing agent with the assistance of Na+ and seed, are highly active as Lewis acid catalysts.

Assessment of fluoroalkyltin compounds as fluorous Lewis acid catalysts

2003 ◽  
Vol 17 (10) ◽  
pp. 795-799 ◽  
Author(s):  
Yasuo Imakura ◽  
Satoru Nishiguchi ◽  
Akihiro Orita ◽  
Junzo Otera
Keyword(s):  
Lewis Acid ◽  
Acid Catalysts ◽  
Lewis Acid Catalysts
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