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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...

Free-Radical Chain Reaction and Polymerization of Alkenes

Free-Radical Chain Reaction and Polymerization of Alkenes

The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...

Benzene to Phenol via Cumene: Hock Process

Benzene to Phenol via Cumene: Hock Process

The synthesis of phenol from benzene via cumene and cumene hydroperoxide is called the Hock process. First, a Friedel–Crafts alkylation reaction of benzene with propene gives cumene. Then cumene forms cumene hydroperoxide via a radical chain reaction. In the chain initiation step, the benzylic hydrogen is abstracted to give a benzylic radical. In the chain propagation step, the benzylic radical reacts with an oxygen diradical to form a cumene hydroperoxide radical. The cumene...

Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene

Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene

The electrophilic addition of hydrogen halides such as HBr to alkenes and nonconjugated dienes gives a single product as per Markovnikov’s rule.

Olefin Metathesis Polymerization: Overview

Olefin Metathesis Polymerization: Overview

Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...

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Updated: Jun 21, 2025

Fabricating Reactive Surfaces with Brush-like and Crosslinked Films of Azlactone-Functionalized Block Co-Polymers

Fabricating Reactive Surfaces with Brush-like and Crosslinked Films of Azlactone-Functionalized Block Co-Polymers

Published on: June 30, 2018

烯与分裂-阿苏烯嵌入的烯.

Laiyun Zhou¹, Fei Qiu², Yeda Ding¹

¹School of Chemistry and Chemical Engineering, Inner Mongolia University, 235 West University Street, Hohhot, 010021, China.

Angewandte Chemie (International ed. in English)

|July 10, 2024

概括

此摘要是机器生成的。

研究人员合成了一种新型的类似青的多环芳 (PAH),Pery-57,具有独特的电子和光学特性. 这一发现为先进材料和量子化学应用开辟了新的途径.

关键词:

反芳香性是一种反芳香性.青烯是一种青烯.没有替代的非替代.聚环芳香碳化合物聚环芳香碳化合物激进的激进的激进的

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Published on: September 18, 2016

Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

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Published on: July 17, 2020

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Last Updated: Jun 21, 2025

Fabricating Reactive Surfaces with Brush-like and Crosslinked Films of Azlactone-Functionalized Block Co-Polymers

Fabricating Reactive Surfaces with Brush-like and Crosslinked Films of Azlactone-Functionalized Block Co-Polymers

Published on: June 30, 2018

Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

Published on: July 17, 2020

科学领域:

材料化学材料化学
量子化学是一个量子化学.
有机合成有机合成

背景情况:

基于青烯的多环芳 (PAH) 由于其独特的电子结构,引起了极大的兴趣.
这些复杂的PAH的合成带来了相当大的挑战,限制了它们的探索.

研究的目的:

通过整合具有分裂青结构的烯框架来合成一种新的类似青的PAH,Pery-57.
研究新合成的Pery-57的独特光物理,氧化还原和电子传输特性.

主要方法:

佩里-57.7的有机合成.
光谱分析包括近红外 (NIR II) 吸收.
电化学研究和可变温度核磁共振 (VT-NMR) 和电子偏磁共振 (VT-EPR) 谱学.
充电运输测量. 充电运输测量.

主要成果:

佩里-57在1200纳米处表现出NIR II吸收和显著的双极矩 (3.5 D).
迪亚尼 (Pery-57^2-) 显示了一个开的单片基态和全局的反芳香性; 迪亚尼 (Pery-57^2+) 预计具有二基性质.
佩里-57证明了p型半导体的行为,其移动性为0.03cm^2V^-1s^-1,这是由于其类似青的结构.

结论:

佩里-57的成功合成克服了阿兹类PAHs之前的合成挑战.
佩里-57显示出卓越的电子和光学特性,包括独特的氧化还原行为和电荷传输.
这项工作突出了蓝烯类PAHs作为非替代PAHs的独特类别的潜力,用于材料科学和量子化学的先进应用.