含有推拉诺博纳迪烯衍生物的C7-异原子的合成和光诱导的切换特性
Daniel Krappmann1, Andreas Hirsch1
1Department Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nikolaus-Fiebiger Straße 10, 91058 Erlangen, Germany.
Beilstein journal of organic chemistry
|April 29, 2025
概括
研究人员合成了含有异原子的新型norbornadiene (NBD) 衍生物,创造了新的光开关. 这些NBD化合物显示了光谱红移,并研究了它们的转化为四旋旋气 (QC) 同体.
科学领域:
- 有机化学 有机化学
- 摄影化学的使用.
- 材料科学 材料科学 材料科学
背景情况:
- 诺博纳 (NBD) 衍生物以其光色特性而闻名.
- 纳入异原子可以调整有机分子的电子和光物理特性.
研究的目的:
- 为了合成和描述新型的异构原子结合的诺博纳 (NBD) 衍生物.
- 调查这些NBD衍生物的潜在转化为四旋环 (QC) 同体.
- 分析合成化合物的光谱特性和逆转换行为.
主要方法:
- 用推拉替代和异原子合并 (氧或) 合成NBD衍生物.
- 使用紫外线和NMR光谱学进行表征.
- 研究norbornadiene的热和催化逆转换到四旋旋气同位素的研究.
主要成果:
- 成功合成了一种新的异原子内置NBD光开关家族.
- 观察到光谱特征 (λmax和λonset) 的红移,与同等周期的类似物相比.
- 研究了NBD-QC同位素对的转化途径和稳定性.
结论:
- 不同原子的结合和推拉替代有效地创建了基于NBD的新型光开关.
- 合成的化合物表现出独特的光谱特性.
- 该NBD-QC系统为光开关应用提供了进一步发展的潜力.
相关概念视频
Photochemical Electrocyclic Reactions: Stereochemistry
1.8K
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
Selection Rules: Photochemical Activation
1.8K
Thermal and Photochemical Electrocyclic Reactions: Overview
2.2K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.2K
Cycloaddition Reactions: MO Requirements for Photochemical Activation
2.0K
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.
2.0K
Thermal Electrocyclic Reactions: Stereochemistry
1.9K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
1.9K
Cycloaddition Reactions: Overview
2.5K
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
2.5K
Stereoisomerism
11.6K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
11.6K


