scholarly journals Metal-Free Catalysts for the Polymerization of Alkynyl-Based Monomers

Catalysts ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 1 ◽  
Author(s):  
Jie Zhang ◽  
Zhiming Zhang ◽  
Fulin Yang ◽  
Haoke Zhang ◽  
Jingzhi Sun ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Research Focus ◽  
Catalytic Systems ◽  
Metal Free ◽  
Catalyst Free ◽  
Material Sciences ◽  
Acid Catalyzed

Novel polymerizations based on alkyne monomers are becoming a powerful tool to construct polymers with unique structures and advanced functions in the areas of polymer and material sciences, and scientists have been attracted to develop a variety of novel polymerizations in recent decades. Therein, catalytic systems play an indispensable role in the influence of polymerization efficiencies and the performances of the resultant polymers. Concerning the shortcomings of metallic catalysts, much of the recent research focus has been on metal-free polymerization systems. In this paper, metal-free catalysts are classified and the corresponding polymerizations are reviewed, including organobase-catalyzed polymerizations, Lewis-acid-catalyzed polymerizations, as well as catalyst-free polymerizations. Moreover, the challenges and perspectives in this area are also briefly discussed.

A Metal‐Free, Organo Lewis Acid Catalyzed Synthesis of Highly Substituted Oxazoles

2019 ◽  
Vol 4 (31) ◽  
pp. 8973-8977 ◽  
Author(s):  
Gullapalli Kumaraswamy ◽  
Maram Gangadhar
Keyword(s):  
Lewis Acid ◽  
Metal Free ◽  
Acid Catalyzed

ChemInform Abstract: Metal-Free Reductions of N-Heterocycles via Lewis Acid Catalyzed Hydrogenation.

ChemInform ◽  
2010 ◽  
Vol 41 (47) ◽  
pp. no-no
Author(s):  
Stephen J. Geier ◽  
Preston A. Chase ◽  
Douglas W. Stephan
Keyword(s):  
Lewis Acid ◽  
Metal Free ◽  
Acid Catalyzed

Metal-free reductions of N-heterocycles via Lewis acid catalyzed hydrogenation

2010 ◽  
Vol 46 (27) ◽  
pp. 4884 ◽  
Author(s):  
Stephen J. Geier ◽  
Preston A. Chase ◽  
Douglas W. Stephan
Keyword(s):  
Lewis Acid ◽  
Metal Free ◽  
Acid Catalyzed

scholarly journals Comparative DFT study of metal-free Lewis acid-catalyzed C–H and N–H silylation of (hetero)arenes: mechanistic studies and expansion of catalyst and substrate scope

RSC Advances ◽  
2019 ◽  
Vol 9 (64) ◽  
pp. 37675-37685
Author(s):  
Pan Du ◽  
Jiyang Zhao
Keyword(s):  
Lewis Acid ◽  
Dft Study ◽  
Mechanistic Studies ◽  
Metal Free ◽  
Acid Catalyzed

We investigated the mechanism of the dehydrosilylation of (hetero)arenes and extended the scope of the silylation catalysts and substrates.

Synthesis and Applications of Chiral Bicyclic Bisborane Catalysts

Synthesis ◽  
2021 ◽  
Author(s):  
Zhao-Ying Yang ◽  
Ming Zhang ◽  
Xiao-Chen Wang
Keyword(s):  
Transition Metal ◽  
Lewis Acid ◽  
Asymmetric Hydrogenation ◽  
Acid Catalysts ◽  
Frustrated Lewis Pairs ◽  
Lewis Acid Catalysts ◽  
Lewis Bases ◽  
Metal Free ◽  
Hydrogenation Reactions ◽  
Acid Catalyzed

The development of chiral borane Lewis acid catalysts opened the door for transition-metal-free catalyzed asymmetric organic reactions. Herein, we have summarized our work on the preparation of two classes of novel chiral bicyclic bisborane Lewis acid catalysts derived from C2-symmetric [3.3.0] dienes and [4.4] dienes, respectively. These catalysts not only form frustrated Lewis pairs with Lewis bases to catalyze asymmetric hydrogenation reactions but also activate Lewis basic functional groups in traditional Lewis acid catalyzed asymmetric reactions.

Lewis acid-catalyzed 2-arylquinazoline formation from N′-arylbenzimidamides and paraformaldehyde

2016 ◽  
Vol 18 (21) ◽  
pp. 5773-5776 ◽  
Author(s):  
Xiufang Cheng ◽  
Huamin Wang ◽  
Fuhong Xiao ◽  
Guo-Jun Deng
Keyword(s):  
Transition Metal ◽  
Lewis Acid ◽  
Efficient Procedure ◽  
Metal Free ◽  
Acid Catalyzed

An efficient procedure for the synthesis of 2-arylquinazolines from N′-arylbenzimidamides has been developed under transition-metal-free conditions.

Lewis acid-catalyzed regioselective C–H carboxamidation of indolizines with dioxazolones via an acyl nitrene type rearrangement

2021 ◽  
Author(s):  
Dan Song ◽  
Changfeng Huang ◽  
Peishi Liang ◽  
Baofu Zhu ◽  
Xiang Liu ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Metal Free ◽  
Acid Catalyzed

An efficient, direct, and novel Lewis acid-catalyzed regioselective C–H carboxamidation of indolizines with dioxazolones via an acyl nitrene type rearrangement under metal-free conditions has been documented.

Metal-Free Photoinduced Hydroalkylation Cascade Enabled by an Electron-Donor-Acceptor Complex

2020 ◽  
Author(s):  
José Tiago Menezes Correia ◽  
Gustavo Piva da Silva ◽  
Camila Menezes Kisukuri ◽  
Elias André ◽  
Bruno Pires ◽  
...  
Keyword(s):  
Electron Donor ◽  
Functional Group ◽  
Photoexcited Electron ◽  
One Pot ◽  
Quaternary Centers ◽  
Metal Free ◽  
Acceptor Complex ◽  
Catalyst Free ◽  
Donor Acceptor ◽  
Radical Cascade

A metal- and catalyst-free photoinduced radical cascade hydroalkylation of 1,7-enynes has been disclosed. The process is triggered by a SET event involving a photoexcited electron-donor-aceptor complex between NHPI ester and Hantzsch ester, which decomposes to afford a tertiary radical that is readily trapped by the enyne. <a>The method provides an operationally simple, robust and step-economical approach to the construction of diversely functionalized dihydroquinolinones bearing quaternary-centers. A sequential one-pot hydroalkylation-isomerization approach is also allowed giving access to a family of quinolinones. A wide substrate scope and high functional group tolerance was observed in both approaches</a>.

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