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Updated: Jun 24, 2026

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes
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内部二甲基罗基罗基桥接二甲基宏循环:一个多功能光平台

Huan Zhou1, Yuxuan Zhang1, Zhiye Zheng1

  • 1Department of Chemistry, College of Science, Center for Supramolecular Chemistry & Catalysis, Shanghai University 99 Shangda Road Shanghai 200444 P. R. China wanghy@shu.edu.cn.

Chemical science
|December 11, 2024
PubMed
概括

研究人员开发了一种新型的桥梁宏循环,其核心是二甲基烯 (DPP) 和烯臂. 这种宏观循环表现出强烈的光,可调节的辐射,以及作为铜离子传感器和潜伏指纹成像的潜在应用.

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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
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Five-Membered Heterocyclic Aromatic Compounds: Overview

Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom, respectively.
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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.