cycloaddition

简明释义

英[/ˌsaɪkloʊəˈdɪʃən/]美[/ˌsaɪkloʊəˈdɪʃən/]

n. 环加成作用

英英释义

单词用法

同义词

反义词

例句

1.In this thesis, we have focused on the synthesis of highly substituted furan by the cycloaddition reaction of conjugated enynones with nitrones.

本论文是关于共轭烯炔酮与硝酮化合物反应生成多取代的呋喃化合物的研究，主要从三个方面进行了研究。

2.With vinyl acetate as reactant in place of acetylene and its derivates in 1, 3 dipolar cycloaddition, the target product was obtained successfully.

在此步反应中成功地以醋酸乙烯代替乙炔及其衍生物作为环合试剂进行了1,3 -偶极环加成反应，得到了目标产物。

3.The synthesis of polysubstituted aromatic compounds by using tandem cycloaddition aromatization reaction was reported.

本文报道用环加成-芳构化串连反应制备多取代芳香族化合物的方法。

4.The reaction mechanism of 8-dimethyl-7-methoxy-5-ethenyl-nonanenitrile oxide cycloaddition has been studied with the molecular orbital AM1 method and transition state theory.

用过渡态理论和AM 1方法，对8-二甲基- 7-甲氧基- 5 -烯-壬腈氧化物分子内环加成反应机理进行了研究。

5.The research advances of the chiral ligands metal complexes catalysts used in asymmetric 1, 3-dipolar cycloaddition reactions were reviewed in this paper.

综述了手性配体金属络合物催化剂催化1,3 -偶极环加成反应的研究进展。

6.The cycloaddition reaction of dichlorocarbene with C60 has been studied by using the semi-empirical method AM1. A reasonable mechanism of the reaction has been suggested.

用半经验am 1方法研究了C _(60)与单态二氯卡宾环加成反应的反应机理。

7.In this paper, the catalysts and reaction conditions of the cycloaddition of carbon dioxide and propylene oxide are studied.

研究了碳酸丙烯酯和甲醇经酯交换制备碳酸二甲酯的催化剂及反应工艺条件。

8.At last, the catalytic mechanism of cycloaddition of propylene oxide with carbon dioxide is discussed.

论文最后对该催化剂在完成环加成反应过程中的催化机理进行了初步探讨。

9.The synthesis of polysubstituted aromatic compounds by using a tandem cycloaddition aromatization reaction was reported.

报道了通过串联环加成芳构化反应合成多取代芳族化合物的方法。

10.In organic chemistry, cycloaddition is often used to create complex molecular structures.

在有机化学中，环加成反应常用于创建复杂的分子结构。

11.The selectivity in cycloaddition can be influenced by the electronic properties of the reactants.

反应物的电子特性可以影响环加成反应的选择性。

12.The process of cycloaddition involves the formation of a cyclic compound from two or more reactants.

这个过程中的环加成反应涉及从两个或多个反应物形成一个环状化合物。

13.The Diels-Alder reaction is a well-known example of a [2+4] cycloaddition reaction.

Diels-Alder反应是一个著名的[2+4] 环加成反应的例子。

14.Researchers are exploring new catalysts to improve the efficiency of cycloaddition reactions.

研究人员正在探索新的催化剂，以提高环加成反应的效率。

作文

Cycloaddition is a fascinating reaction in organic chemistry that involves the formation of a cyclic compound from two or more reactants. This type of reaction is crucial for the synthesis of various complex molecules, and it plays a significant role in the development of pharmaceuticals, agrochemicals, and materials science. The most common type of cycloaddition is the [span]cycloaddition[/span] reaction, where two unsaturated molecules combine to form a ring structure. One of the most well-known examples is the Diels-Alder reaction, which involves a diene and a dienophile reacting to produce a cyclohexene derivative.Understanding the mechanisms behind [span]cycloaddition[/span] reactions can provide insight into how molecular architecture is constructed. These reactions typically proceed through a concerted mechanism, meaning that bond-making and bond-breaking occur simultaneously without intermediates. This characteristic makes [span]cycloaddition[/span] reactions particularly efficient and selective, often leading to high yields of the desired product.In addition to the Diels-Alder reaction, there are several other types of [span]cycloaddition[/span] processes, including [2+2] and [3+2] cycloadditions. Each of these reactions has unique features and applications. For instance, [2+2] cycloadditions often involve the formation of four-membered rings, which can be challenging to synthesize through other methods. On the other hand, [3+2] cycloadditions are valuable for producing five-membered rings, which are common in many natural products and bioactive compounds.The significance of [span]cycloaddition[/span] reactions extends beyond academic research; they are also employed in industrial applications. For example, the pharmaceutical industry utilizes [span]cycloaddition[/span] reactions to create novel drug candidates with improved efficacy and reduced side effects. By manipulating the reaction conditions and the choice of starting materials, chemists can design molecules that target specific biological pathways.Moreover, [span]cycloaddition[/span] reactions are not limited to small organic molecules. They can also be applied in polymer chemistry, where they facilitate the synthesis of new materials with tailored properties. Through the strategic use of [span]cycloaddition[/span] reactions, researchers can create polymers that exhibit desirable characteristics such as increased strength, flexibility, or thermal stability.In conclusion, [span]cycloaddition[/span] is an essential concept in organic chemistry that encompasses a variety of reactions leading to the formation of cyclic compounds. Its applications in drug discovery and materials science highlight its importance in both academic and industrial settings. As researchers continue to explore the potential of [span]cycloaddition[/span] reactions, we can expect to see innovative solutions to complex chemical challenges, ultimately advancing our understanding and utilization of organic compounds in everyday life.

环加成反应是有机化学中一个迷人的反应，涉及从两个或多个反应物形成环状化合物。这种反应对合成各种复杂分子至关重要，并在药物、农用化学品和材料科学的发展中发挥了重要作用。最常见的环加成反应是[span]环加成反应[/span]，其中两个不饱和分子结合形成环结构。其中一个最著名的例子是Diels-Alder反应，它涉及一个二烯和一个二烯亲和体反应生成一个环己烯衍生物。理解[span]环加成反应[/span]背后的机制可以提供关于分子结构构建的洞察。这些反应通常通过协同机制进行，这意味着在没有中间体的情况下同时发生成键和断键。这一特性使得[span]环加成反应[/span]特别高效且选择性，通常导致所需产品的高产率。除了Diels-Alder反应，还有几种其他类型的[span]环加成反应[/span]过程，包括[2+2]和[3+2]环加成。每种反应都有其独特的特征和应用。例如，[2+2]环加成通常涉及四元环的形成，而这些环通过其他方法合成可能会很困难。另一方面，[3+2]环加成对于生成五元环非常有价值，这些五元环在许多天然产物和生物活性化合物中很常见。[span]环加成反应[/span]的重要性超越了学术研究；它们也被应用于工业应用。例如，制药行业利用[span]环加成反应[/span]来创建具有更高疗效和更少副作用的新药候选物。通过操控反应条件和起始材料的选择，化学家可以设计针对特定生物通路的分子。此外，[span]环加成反应[/span]不仅限于小有机分子。它们还可以应用于聚合物化学，促进新材料的合成，具有定制的特性。通过战略性地使用[span]环加成反应[/span]，研究人员可以创造出表现出理想特性的聚合物，如增强的强度、柔韧性或热稳定性。总之，[span]环加成反应[/span]是有机化学中的一个基本概念，涵盖了导致环状化合物形成的各种反应。它在药物发现和材料科学中的应用突显了它在学术界和工业界的重要性。随着研究人员继续探索[span]环加成反应[/span]的潜力，我们可以期待看到对复杂化学挑战的创新解决方案，最终推进我们对有机化合物在日常生活中理解和利用的进步。