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相关概念视频

Physical Properties of Amines01:26

Physical Properties of Amines

3.0K
Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.
3.0K
Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

5.8K
Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
5.8K
Preparation of 1° Amines: Azide Synthesis01:22

Preparation of 1° Amines: Azide Synthesis

3.9K
Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
3.9K
Preparation of Amides01:29

Preparation of Amides

3.0K
Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...
3.0K
Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

2.9K
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
2.9K
Structure of Amines01:19

Structure of Amines

2.5K
The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’...
2.5K

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Microwave-Assisted Preparation of 1-Aryl-1H-pyrazole-5-amines
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Microwave-Assisted Preparation of 1-Aryl-1H-pyrazole-5-amines

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设计,合成和杀虫活动的Imidazo[4,5-b]含有氨基片的Pyridine化合物.

Yunfeng Yao1, Xinlin Li2,3, Liqi Zhou2

  • 1School of Hunan Normal University, Changsha, China.

Chemistry & biodiversity
|June 13, 2025
PubMed
概括

新的imidazo[4,5-b]pyridine化合物显示出对关键农业害虫的强有力的杀虫活性,如Nilaparvata lugens和Mythimna separata. 这些新型化合物为开发下一代害虫控制解决方案提供了有希望的线索.

关键词:
氨基片段氨基片段氨基片段伊米达佐[4,5‐b]皮里丁化合物杀虫剂是一种杀虫剂.氧化的硫化.结构与活动之间的关系.

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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
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科学领域:

  • 有机化学 有机化学
  • 农业科学 农业科学
  • 昆虫学 昆虫学是一门学科.

背景情况:

  • 害虫耐药性需要开发新的杀虫剂.
  • 伊米达佐[4,5-b]里丁支架正在被探索,因为它们的潜在生物活性.

研究的目的:

  • 合成和表征含有氨基基碎片的新型伊米达佐[4,5-b]氨酸衍生物.
  • 评估这些化合物对农业害虫的杀虫功效.

主要方法:

  • 化学合成的伊米达佐[4,5-b]皮里丁化合物.
  • 使用质子核磁共振 (1H NMR),碳-13 NMR (13C NMR) 和高分辨率质谱学进行表征.
  • 预先的生物测试以确定对尼拉帕尔瓦塔 (Nilaparvata lugens),Mythimna separata和Plutella xylostella的杀虫活性.

主要成果:

  • 大多数合成的化合物表现出显著的杀虫活性.
  • 化合物8n对N. lugens的死亡率为46.85%,表现优于Oxazosulfyl.
  • 化合物10a实现了对M. separata和P. xylostella的100%死亡率,超过了Oxazosulfyl.

结论:

  • 合成的氨基-胺基[4,5-b]氨酸衍生物表现出有希望的杀虫性能.
  • 这些化合物为开发新的有效杀虫剂提供了宝贵的结构见解.
  • 进一步的结构-活性关系研究可以优化用于害虫管理的化合物.