Fluoride Ion Chelation By a Bidentate Phosphonium/Borane Lewis Acid

2008 ◽  
Vol 130 (33) ◽  
pp. 10890-10891 ◽  
Author(s):  
Todd W. Hudnall ◽  
Young-Min Kim ◽  
Magnus W. P. Bebbington ◽  
Didier Bourissou ◽  
François P. Gabbaï
Keyword(s):  
Lewis Acid ◽  
Fluoride Ion

A facile method to effectively combine plasmon enhanced fluorescence (PEF) and fluoride-Lewis acid based reactions to detect low concentrations of fluoride in solution

RSC Advances ◽  
2016 ◽  
Vol 6 (82) ◽  
pp. 78918-78929 ◽  
Author(s):  
Richard Appiah-Ntiamoah ◽  
Amutha Chinnappan ◽  
Hern Kim
Keyword(s):  
Silver Nanoparticles ◽  
Detection Limit ◽  
Lewis Acid ◽  
Fluoride Ion ◽  
Purcell Effect ◽  
Enhanced Fluorescence ◽  
Plasmon Enhanced Fluorescence ◽  
Low Concentrations

Synergizing the Purcell-effect of silver nanoparticles and fluoride-Lewis acid based reactions to enhance the sensitivity and detection limit of a fluoride ion chemodosimeter.

Fluoride ion complexation by a B2/Hg heteronuclear tridentate lewis acid

2008 ◽  
pp. 4442 ◽  
Author(s):  
Christopher L. Dorsey ◽  
Pawel Jewula ◽  
Todd W. Hudnall ◽  
James D. Hoefelmeyer ◽  
Thomas J. Taylor ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Fluoride Ion ◽  
Ion Complexation

Lewis Acid Promoted Prins Cyclization Using Non-Conjugated Diene Alcohol: Sequential Reactions Terminated by Fluoride Ion

Heterocycles ◽  
2018 ◽  
Vol 96 (8) ◽  
pp. 1363 ◽  
Author(s):  
Kouichi Matsumoto ◽  
Rina Yanagi ◽  
Kouji Yamaguchi ◽  
Erin Hayashi ◽  
Eri Yasuda ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Fluoride Ion ◽  
Conjugated Diene ◽  
Prins Cyclization ◽  
Sequential Reactions

scholarly journals Prins fluorination cyclisations: Preparation of 4-fluoro-pyran and -piperidine heterocycles

2010 ◽  
Vol 6 ◽  
Author(s):  
Guillaume G Launay ◽  
Alexandra M Z Slawin ◽  
David O'Hagan
Keyword(s):  
Lewis Acid ◽  
Fluoride Ion ◽  
Prins Reaction ◽  
Prins Reactions

The Prins reaction was investigated using BF3·OEt2 as a Lewis acid. It has been recently demonstrated, that if BF3·OEt2 is used in stoichiometric amounts then these reactions generate fluorinated products where the BF3·OEt2 contributes fluoride ion to quench the intermediate carbocations. In this study oxa- and aza-Prins reactions for the synthesis of 4-fluoro-pyrans and -piperidines were investigated. The products were obtained in good yields, but only with moderate diastereoselectivity. These Prins fluorination reactions can be accelerated under microwave conditions. The study extends the Prins fluorination methodology for the generation of the C–F bond in heterocycles.

Cobalt/Lewis Acid Catalysis for Hydrocarbofunctionalization of Alkynes via Cooperative C–H Activation

2020 ◽  
Author(s):  
Chang-Sheng Wang ◽  
Sabrina Monaco ◽  
Anh Ngoc Thai ◽  
Md. Shafiqur Rahman ◽  
Chen Wang ◽  
...  
Keyword(s):  
Catalytic System ◽  
Lewis Acid ◽  
Hydrogen Transfer ◽  
Acid Catalysis ◽  
Rate Limiting Step ◽  
Site Selectivity ◽  
Set Up ◽  
Site Selective ◽  
First Time ◽  
Rate Limiting

A catalytic system comprised of a cobalt-diphosphine complex and a Lewis acid (LA) such as AlMe3 has been found to promote hydrocarbofunctionalization reactions of alkynes with Lewis basic and electron-deficient substrates such as formamides, pyridones, pyridines, and azole derivatives through site-selective C-H activation. Compared with known Ni/LA catalytic system for analogous transformations, the present catalytic system not only feature convenient set up using inexpensive and bench-stable precatalyst and ligand such as Co(acac)3 and 1,3-bis(diphenylphosphino)propane (dppp), but also display distinct site-selectivity toward C-H activation of pyridone and pyridine derivatives. In particular, a completely C4-selective alkenylation of pyridine has been achieved for the first time. Mechanistic stidies including DFT calculations on the Co/Al-catalyzed addition of formamide to alkyne have suggested that the reaction involves cleavage of the carbamoyl C-H bond as the rate-limiting step, which proceeds through a ligand-to-ligand hydrogen transfer (LLHT) mechanism leading to an alkyl(carbamoyl)cobalt intermediate.

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