The Bis(allyl)bismuth Cation: A Reagent for Direct Allyl Transfer by Lewis Acid Activation and Controlled Radical Polymerization

2012 ◽  
Vol 51 (52) ◽  
pp. 13011-13015 ◽  
Author(s):  
Crispin Lichtenberg ◽  
Fangfang Pan ◽  
Thomas P. Spaniol ◽  
Ulli Englert ◽  
Jun Okuda
Keyword(s):  
Radical Polymerization ◽  
Lewis Acid ◽  
Controlled Radical Polymerization ◽  
Acid Activation

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>

Controlled radical polymerization of hydrophilic and zwitterionic brush-like polymers from silk fibroin surfaces

2020 ◽  
Vol 8 (45) ◽  
pp. 10392-10406
Author(s):  
Danielle L. Heichel ◽  
Ngoc Chau H. Vy ◽  
Shawn P. Ward ◽  
Douglas H. Adamson ◽  
Kelly A. Burke
Keyword(s):  
Protein Adsorption ◽  
Radical Polymerization ◽  
Silk Fibroin ◽  
Cell Attachment ◽  
Controlled Radical Polymerization

Silk fibroin films were modified with zwitterionic and hydrophilic brush-like polymers via surface-initiated ATRP, resulting in surfaces that reduced protein adsorption and cell attachment.

Bacterial Redox Potential Powers Controlled Radical Polymerization

2020 ◽  
Author(s):  
Mitchell D. Nothling ◽  
Hanwei Cao ◽  
Thomas G. McKenzie ◽  
Dianna M. Hocking ◽  
Richard A. Strugnell ◽  
...  
Keyword(s):  
Redox Potential ◽  
Radical Polymerization ◽  
Controlled Radical Polymerization
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