相关实验视频

Updated: Jul 1, 2025

A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis

A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis

Published on: February 16, 2020

一种通过光化学重组激活氧胺同解的新方法

Sergey Cherkasov¹, Dmitriy Parkhomenko², Denis Morozov²

¹Novosibirsk State University, Pirogova 1, 630090, Novosibirsk, Russia. cherkasov-s_95@mail.ru.

Physical chemistry chemical physics : PCCP

|March 12, 2024

概括

我们引入了一种新的光化学激活方法,在氧化物介导的聚合过程中使用中氧化重新排列用于氧胺同解. 这种方法促进了键断裂,使得可控的聚合过程成为可能.

科学领域:

聚合物化学聚合物化学
摄影化学的使用.
有机合成有机合成

背景情况:

氧化物介导聚合 (NMP) 是一种受控的激素聚合技术.
氧胺是NMP的关键启动剂,需要有效的激活方法.
光化学激活提供了对聚合物的空间和时间控制.

研究的目的:

探索尼龙-氧齐里丁重组作为一种新的光化学激活策略,用于氧胺.
为了研究基组在2,5-二胺醇3-氧化物基的氧胺基中的光异构化.
量化这种重新排列对氧胺同解的影响.

主要方法:

合成基于2,5-二二胺醇3氧化物的醇基胺.
用光化学辐射研究来诱导龙-氧齐里丁重组的研究.
使用光谱技术识别光解产品.
测量量子产量和激活能量用于同解.

主要成果:

在光化学激活后,成功实现了龙-氧齐里丁重组.
确定了氧胺的光异构化产物.
确定了光解的量子产量.
尼龙转化为氧齐里丁,使酒精胺同解激活能量减少了大约10kJmol-1.1.

结论:

亚烯-氧齐里丁重组是一种可行的光化学激活方法,用于氧胺.
这种方法为氧化物中介聚合的受控启动提供了一个新的途径.
观察到的激活能量的减少表明光化学控制下同解效率提高.

更多相关视频

Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides CHIPS

Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides CHIPS

Published on: June 20, 2014

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

相关概念视频

Cycloaddition Reactions: MO Requirements for Photochemical Activation

Cycloaddition Reactions: MO Requirements for Photochemical Activation

Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.

Photochemical Electrocyclic Reactions: Stereochemistry

Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation

Radical Anti-Markovnikov Addition to Alkenes: Mechanism

Radical Anti-Markovnikov Addition to Alkenes: Mechanism

The reaction of hydrogen bromide with alkenes in the presence of hydroperoxides or peroxides proceeds via anti-Markovnikov addition. The radical chain reaction comprises initiation, propagation, and termination steps.
The mechanism starts with chain initiation, which involves two steps. In the first chain initiation step, a weak peroxide bond is homolytically cleaved upon mild heating to form two alkoxy radicals. In the second initiation step, a hydrogen atom is abstracted by the alkoxy...

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.