Tris(2,4-difluorophenyl)borane/Triisobutylphosphine Lewis Pair: A Thermostable and Air/Moisture-Tolerant Organic Catalyst for the Living Polymerization of Acrylates

2021 ◽  
Author(s):  
Zhen-Hua Zhang ◽  
Xing Wang ◽  
Xiao-Jun Wang ◽  
Yuesheng Li ◽  
Miao Hong
Keyword(s):  
Living Polymerization ◽  
Organic Catalyst

scholarly journals Synthesis, Characterization of Chitosan-Aluminum Oxide Nanocomposite for Green Synthesis of Annulated Imidazopyrazol Thione Derivatives

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1160
Author(s):  
Abir S. Abdel-Naby ◽  
Sara Nabil ◽  
Sarah Aldulaijan ◽  
Ibtisam M. Ababutain ◽  
Azzah I. Alghamdi ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Aluminum Oxide ◽  
Reaction Medium ◽  
Thiol Group ◽  
Docking Studies ◽  
Significant Loss ◽  
Gram Negative Bacteria ◽  
Organic Catalyst ◽  
Group 1

Chitosan-aluminum oxide nanocomposite was synthesized, characterized, and used as a green heterogeneous catalyst to synthesize novel imidazopyrazolylthione derivatives. Nanocomposite polymeric material was characterized by EDS-SEM and XRD. The powerful catalytic activity, and its base character of the nanocomposite, was used to synthesize imidazopyrazolylthione (1) in a good yield compared to traditional cyclocondensation synthesis. Using the nanocomposite catalyst, substitution of the thiol group (1) afforded the corresponding thiourea (2) and the corresponding ester (3). The efficiency of the nanocomposite over the traditional base organic catalyst, Et3N and NaOH, makes it an effective, economic, and reproducible nontoxic catalyst. Moreover, the heterogeneous nanocomposite polymeric film was easily isolated from the reaction medium, and recycled up to four times, without a significant loss of its catalytic activity. The newly synthesized derivatives were screened as antibacterial agents and showed high potency. Molecular docking was also performed for a more in-depth investigation. The results of the docking studies have demonstrated that the docked compounds have strong interaction energies with both Gram-positive and Gram-negative bacteria.

Designing a mesoporous hybrid organo-silica thin film prepared from an organic catalyst

2021 ◽  
Vol 2021 (2) ◽  
pp. 5-8
Author(s):  
Anna Sumardi ◽  
Muthia Elma ◽  
Erdina Lulu Atika Rampun ◽  
Aptar Eka Lestari ◽  
Zaini Lambri Assyaifi ◽  
...  
Keyword(s):  
Thin Film ◽  
Silica Thin Film ◽  
Organic Catalyst

Controlled and Efficient Polymerization of Methyl Methacrylate Catalyzed by Pyridinylidenaminophosphines Based Lewis Pairs

2021 ◽  
Author(s):  
Fang Ge ◽  
Sun Li ◽  
Zhe Wang ◽  
Wenzhong Zhang ◽  
Xiaowu Wang
Keyword(s):  
Molecular Weight ◽  
Methyl Methacrylate ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Living Polymerization ◽  
Narrow Molecular Weight Distribution ◽  
Synthetic Approaches ◽  
Lewis Pairs

Developing different synthetic approaches to realize controlled or living polymerization are aspirational to achieve polymers with defined molecular weight, narrow molecular weight distribution and unambiguous structures by polymer chemists. Herein,...

Living Polymerization Caught in the Act: Direct Observation of an Arrested Intermediate in Metathesis Polymerization

2019 ◽  
Vol 141 (25) ◽  
pp. 10039-10047 ◽  
Author(s):  
Jung-Ah Song ◽  
Bohyun Park ◽  
Soohyung Kim ◽  
Cheol Kang ◽  
Dongwhan Lee ◽  
...  
Keyword(s):  
Direct Observation ◽  
Living Polymerization ◽  
Metathesis Polymerization

Synthesis of PMMA-b-PS Block Copolymer by Emulsion ATRP and its Self-Assembly Property

2013 ◽  
Vol 705 ◽  
pp. 115-119
Author(s):  
Bao Yong Tian ◽  
Er Jun Tang ◽  
Miao Yuan ◽  
Rui Xia Hao ◽  
Cun Man Li ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Block Copolymer ◽  
Self Assembly ◽  
Potential Application ◽  
Morphological Characteristic ◽  
Living Polymerization ◽  
The Self ◽  
Emulsion System ◽  
Copolymer Concentration ◽  
Ft Ir

The well-defined block copolymer PMMA-b-PS was prepared by two-step ATRP in emulsion system. GPC results indicate that Mn increased linearly with conversion and polydispersity remained relatively narrow. It presents the characteristics of living polymerization in emulsion system. FT-IR demonstrated that block copolymer PMMA-b-PS could be successfully synthesized by ATRP with macroinitiator PMMA-Cl in emulsion system. The morphological characteristic of the self-assembly depends on the block copolymer concentration and transforms between spheres and rodlike micelles. The property indicates a perfect potential application in drug delivery materials.

scholarly journals Living Polymerization of Propylene with ansa-Dimethylsilylene(fluorenyl)(cumylamido) Titanium Complexes

Polymers ◽  
2017 ◽  
Vol 9 (12) ◽  
pp. 131 ◽  
Author(s):  
Huajin Wang ◽  
Xinwei Wang ◽  
Yanjie Sun ◽  
Hailong Cheng ◽  
Takeshi Shiono ◽  
...  
Keyword(s):  
Living Polymerization ◽  
Titanium Complexes
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