Catalyst‐Free Enantiospecific Olefination with In Situ Generated Organocerium Species

2019 ◽  
Vol 58 (4) ◽  
pp. 1188-1192 ◽  
Author(s):  
Arif Music ◽  
Clément Hoarau ◽  
Nicolas Hilgert ◽  
Florian Zischka ◽  
Dorian Didier
Keyword(s):  
Catalyst Free

Light Directs Monomer Coordination in Catalyst-Free Grignard Photopolymerization

2021 ◽  
Author(s):  
Eliot Woods ◽  
Alexandra Berl ◽  
Leanna Kantt ◽  
Michael Wasielewski ◽  
Brandon E. Haines ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Radical Anion ◽  
Elevated Temperatures ◽  
Spectroscopic Studies ◽  
Computational Investigation ◽  
Catalyst Free ◽  
Active Layers ◽  
End Groups ◽  
Type Coupling

π-Conjugated polymers can serve as active layers in flexible and lightweight electronics, and are conventionally synthesized by transition-metal-mediated polycondensation at elevated temperatures. We recently reported a photopolymerization of electron-deficient heteroaryl Grignard monomers that enables the catalyst-free synthesis of n-type π-conjugated polymers. Herein we provide an experimental and computational investigation of the mechanism of this photopolymerization. Spectroscopic studies performed <i>in situ</i> and after quenching reveal that the propagating species is a radical anion with halide end groups. DFT calculations for model oligomers suggest a Mg-templated S<sub>RN</sub>1-type coupling, in which Grignard monomer coordination to the radical anion chain avoids the formation of free sp<sup>2</sup> radicals and enables C–C bond formation with very low barriers. We find that light plays an unusual role in the reaction, photoexciting the radical anion chain to shift electron density to the termini and thus favor productive monomer binding.

In situ generation and protonation of the isocyanide/acetylene adduct: a powerful catalyst-free strategy for multicomponent synthesis of ketenimines, aza-dienes, and heterocycles

RSC Advances ◽  
2015 ◽  
Vol 5 (117) ◽  
pp. 97044-97065 ◽  
Author(s):  
Sadegh Rostamnia
Keyword(s):  
Multicomponent Reactions ◽  
Multicomponent Synthesis ◽  
New Class ◽  
Catalyst Free ◽  
In Situ Generation

In addition to isocyanide-based Ugi, Passerini, van Leusen, and Orru multicomponent reactions, a new class of isocyanide/acetylene-based multicomponent reactions, using zwitterionic adducts, have emerged as powerful methods to synthesize biologically interesting molecules.

Catalyst-Free and Rapid Chemical Approach for in Situ Growth of “Chemically Reactive” and Porous Polymeric Coating

2019 ◽  
Vol 11 (37) ◽  
pp. 34316-34329 ◽  
Author(s):  
Supriya Das ◽  
Avijit Das ◽  
Dibyangana Parbat ◽  
Uttam Manna
Keyword(s):  
Polymeric Coating ◽  
In Situ Growth ◽  
Catalyst Free ◽  
Chemical Approach

Visible photo-induced catalyst-free polymerization via in situ prepared dibromide

2021 ◽  
Vol 144 ◽  
pp. 110195
Author(s):  
Reza Razeghi ◽  
Foad Kazemi ◽  
Nasser Nikfarjam ◽  
Yadollah Shariati ◽  
Babak Kaboudin
Keyword(s):  
Catalyst Free

Catalyst-Free Conjugation and In Situ Quantification of Nanoparticle Ligand Surface Density Using Fluorogenic Cu-Free Click Chemistry

2011 ◽  
Vol 17 (12) ◽  
pp. 3326-3331 ◽  
Author(s):  
Rasmus I. Jølck ◽  
Honghao Sun ◽  
Rolf H. Berg ◽  
Thomas L. Andresen
Keyword(s):  
Click Chemistry ◽  
Surface Density ◽  
Catalyst Free

Catalyst free Synthesis of Highly Functionalized Indolizines from In Situ Generated Pyridinium Ylides via One‐Pot Multicomponent Reaction

2019 ◽  
Vol 4 (13) ◽  
pp. 3717-3721 ◽  
Author(s):  
Vediyappan Ramesh ◽  
Natarajan Savitha Devi ◽  
Marappan Velusamy ◽  
Sivakumar Shanmugam
Keyword(s):  
Multicomponent Reaction ◽  
One Pot ◽  
Catalyst Free ◽  
Pyridinium Ylides
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