Synthesis of block and star copolymers by photoinduced radical coupling process

2009 ◽  
Vol 47 (11) ◽  
pp. 2938-2947 ◽  
Author(s):  
Gokhan Temel ◽  
Binnur Aydogan ◽  
Nergis Arsu ◽  
Yusuf Yagci
Keyword(s):  
Coupling Process ◽  
Radical Coupling ◽  
Star Copolymers

Metal-free deoxygenative sulfonylation of quinoline N-oxides with sodium sulfinates via a dual radical coupling process

2018 ◽  
Vol 5 (17) ◽  
pp. 2604-2609 ◽  
Author(s):  
Long-Yong Xie ◽  
Sha Peng ◽  
Fang Liu ◽  
Guan-Rong Chen ◽  
Wen Xia ◽  
...  
Keyword(s):  
Coupling Process ◽  
Metal Free ◽  
Radical Coupling

The first example of a metal- and reductant-free deoxygenative sulfonylation of quinoline N-oxides with sodium sulfinates via a dual radical coupling process is reported.

An Efficient and Modular Route to C3*-TunePhos-Type Ligands

Synthesis ◽  
2017 ◽  
Vol 49 (16) ◽  
pp. 3726-3730
Author(s):  
Hui Lv ◽  
Xu-Mu Zhang ◽  
Xu Deng ◽  
Yu-Qing Guan ◽  
Ning-Ning Huo ◽  
...  
Keyword(s):  
Chemical Technology ◽  
Bidentate Ligands ◽  
Synthetic Route ◽  
Electronic Effects ◽  
Facile Synthesis ◽  
Coupling Process ◽  
Radical Coupling

An efficient and modular synthetic route to the bidentate C3*-TunePhos was developed, which allowed tunable steric and electronic effects of the ligands. This novel chemical technology highlights a versatile C3*-dibromodiphenyl intermediate that was accomplished by in situ Grignard exchange and subsequent Cu(II)-mediated intra­molecular oxidative radical coupling process. It is worth noting that this advanced intermediate not only could be easily prepared by a diverse array of C3*-TunePhos-type ligands, but also could be used to facile synthesis of other novel type of N,S-centered bidentate ligands.

Transition-metal- and oxidant-free three-component reaction of quinoline N-oxides, sodium metabisulfite and aryldiazonium tetrafluoroborates via a dual radical coupling process

2019 ◽  
Vol 17 (43) ◽  
pp. 9479-9488 ◽  
Author(s):  
Guirong You ◽  
Dan Xi ◽  
Jian Sun ◽  
Liqiang Hao ◽  
Chengcai Xia
Keyword(s):  
Transition Metal ◽  
Sodium Metabisulfite ◽  
Coupling Process ◽  
Radical Coupling ◽  
Three Component Reaction

Synthesis of 2-sulfonylquinolines via a three-component reaction of quinoline N-oxides, sodium metabisulfite, and aryldiazonium tetrafluoroborates under transition-metal- and oxidant-free conditions.

Transition-Metal-Free Synthesis of Thiosulfonates through Radical Coupling Reaction

Synlett ◽  
2018 ◽  
Vol 29 (15) ◽  
pp. 2076-2080 ◽  
Author(s):  
Wen-Ting Wei ◽  
Zhiyong Guo ◽  
Guodong Zhou ◽  
Xu-Dong Xu ◽  
Gan-Ping Chen
Keyword(s):  
Transition Metal ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Mechanistic Studies ◽  
Reaction Conditions ◽  
Coupling Process ◽  
Metal Free ◽  
Radical Coupling ◽  
Radical Coupling Reaction ◽  
High Yields

An efficient and practical transition-metal-free radical ­coupling reaction of sulfonyl hydrazides mediated by NIS/K2S2O8 has been developed to afford a variety of biological activity thiosulfonates in moderate to excellent yields. Compared to a known approach for the synthesis of thiosulfonates from sulfonyl hydrazides, this strategy features high yields, mild reaction conditions, and broad substrate scope. The mechanistic studies revealed that the procedure undergoes via a radical cross-coupling process for the construction of S–S bonds.

Preparation of single chain nanoparticles via photoinduced radical coupling process

2019 ◽  
Vol 113 ◽  
pp. 183-191 ◽  
Author(s):  
Irem Dashan ◽  
Demet Karaca Balta ◽  
Binnur Aydogan Temel ◽  
Gokhan Temel
Keyword(s):  
Single Chain ◽  
Coupling Process ◽  
Radical Coupling

scholarly journals Synthesis of Poly(ε-caprolactone)-Based Miktoarm Star Copolymers through ROP, SA ATRC, and ATRP

Polymers ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 858 ◽  
Author(s):  
Venkatesan Sathesh ◽  
Jem-Kun Chen ◽  
Chi-Jung Chang ◽  
Junko Aimi ◽  
Zong-Cheng Chen ◽  
...  
Keyword(s):  
Gel Permeation Chromatography ◽  
Proton Nuclear Magnetic Resonance ◽  
Atom Transfer ◽  
Force Microscopy ◽  
Radical Coupling ◽  
Flight Mass Spectrometry ◽  
Atomic Force ◽  
Star Copolymers ◽  
Miktoarm Star ◽  
Novel Strategy

The synthesis of novel branched/star copolymers which possess unique physical properties is highly desirable. Herein, a novel strategy was demonstrated to synthesize poly(ε-caprolactone) (PCL) based miktoarm star (μ-star) copolymers by combining ring-opening polymerization (ROP), styrenics-assisted atom transfer radical coupling (SA ATRC), and atom transfer radical polymerization (ATRP). From the analyses of gel permeation chromatography (GPC), proton nuclear magnetic resonance (1H NMR), and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS), well-defined PCL-μ-PSt (PSt: polystyrene), and PCL-μ-PtBA (PtBA: poly(tert-butyl acrylate) μ-star copolymers were successfully obtained. By using atomic force microscopy (AFM), interestingly, our preliminary examinations of the μ-star copolymers showed a spherical structure with diameters of ca. 250 and 45 nm, respectively. We successfully employed combinations of synthetic techniques including ROP, SA ATRC, and ATRP with high effectiveness to synthesize PCL-based μ-star copolymers.

Quantum Mechanical Calculations Suggest That Lignin Polymerization Is Kinetically Controlled

2019 ◽  
Author(s):  
Terry Gani ◽  
Michael Orella ◽  
Eric Anderson ◽  
Michael Stone ◽  
Fikile Brushett ◽  
...  
Keyword(s):  
Plant Cell ◽  
First Principles ◽  
Plant Cell Wall ◽  
Biological Processes ◽  
Plant Cell Walls ◽  
Biomass Valorization ◽  
Effective Strategies ◽  
Radical Coupling ◽  
Kinetically Controlled ◽  
Atomistic Models

Lignin is an abundant biopolymer important for plant function while holding promise as a renewable source of valuable chemicals. Although the lignification process in plant cell walls has been long-studied, a comprehensive, mechanistic understanding on the molecular scale remains elusive. A better understanding of lignification will lead to improved atomistic models of the plant cell wall that could, in turn, inform effective strategies for biomass valorization. Here, using first-principles quantum chemical calculations, we show that a simple model of kinetically-controlled radical coupling broadly rationalizes qualitative experimental observations of lignin structure across a wide variety of biomass types, thus paving the way for predictive, first-principles models of lignification while highlighting the ability of computational chemistry to help illuminate complex biological processes.

scholarly journals Research on Mirror Coupling Process in Array Semiconductor Laser

2021 ◽  
Vol 647 ◽  
pp. 012016
Author(s):  
Ma Zhu ◽  
Wu Guodong ◽  
Gong Da ◽  
Jiang Qiuyue ◽  
Sun Xiang
Keyword(s):  
Semiconductor Laser ◽  
Coupling Process ◽  
Mirror Coupling
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