endocyclic double bond

简明释义

桥环双键

英英释义

例句

1.During the reaction, the endocyclic double bond (环内双键) undergoes a significant transformation.

在反应过程中，环内双键（endocyclic double bond）经历了显著的转变。

2.The endocyclic double bond (环内双键) in cyclohexene contributes to its unique properties.

环己烯中的环内双键（endocyclic double bond）使其具有独特的性质。

3.The identification of an endocyclic double bond (环内双键) can be done using NMR spectroscopy.

可以通过核磁共振光谱法识别环内双键（endocyclic double bond）。

4.In organic chemistry, understanding the reactivity of an endocyclic double bond (环内双键) is crucial for synthesis.

在有机化学中，理解环内双键（endocyclic double bond）的反应性对合成至关重要。

5.The stability of the compound is significantly influenced by the presence of an endocyclic double bond (环内双键).

该化合物的稳定性受到环内双键（endocyclic double bond）的显著影响。

作文

In the realm of organic chemistry, understanding the structure and properties of molecules is crucial for predicting their behavior in various reactions. One important feature that chemists often encounter is the presence of double bonds within cyclic structures. Among these, the term endocyclic double bond refers to a double bond that is located within a ring system of a molecule. This concept is vital as it influences the stability, reactivity, and overall characteristics of the compound. To grasp the significance of endocyclic double bonds, it is essential to compare them with their counterpart, exocyclic double bonds. An exocyclic double bond is found outside of the cyclic structure, which can lead to different chemical properties and reactivity patterns. For instance, compounds with endocyclic double bonds often exhibit unique conformational preferences and can participate in specific types of reactions that are not available to those with only exocyclic double bonds.One classic example of a molecule containing an endocyclic double bond is cyclohexene, where the double bond is part of the cyclic structure. The presence of this double bond affects the molecule's geometry, making it more reactive than cyclohexane, which has only single bonds. This increased reactivity is often exploited in synthetic organic chemistry to create more complex molecules through various reactions, such as electrophilic additions.The stability of endocyclic double bonds can also be influenced by factors such as sterics and electronics. In some cases, the ring size can affect the strain experienced by the double bond, leading to varying degrees of stability. For example, smaller rings may introduce angle strain, which can destabilize the endocyclic double bond, making the compound more reactive. Conversely, larger rings might accommodate the double bond more comfortably, resulting in a more stable structure.Moreover, the stereochemistry associated with endocyclic double bonds plays a significant role in determining the physical and chemical properties of the molecule. The orientation of substituents around the double bond can lead to cis or trans isomers, each possessing distinct characteristics. Understanding these isomeric forms is crucial for chemists when designing molecules for specific applications, particularly in pharmaceuticals where the activity of a drug can depend heavily on its three-dimensional arrangement.In conclusion, the concept of endocyclic double bonds is fundamental in organic chemistry, influencing the reactivity, stability, and properties of cyclic compounds. By studying these bonds, chemists can better predict how molecules will behave in reactions and utilize this knowledge to synthesize new compounds. As research continues to evolve, the understanding of endocyclic double bonds will undoubtedly play a critical role in the advancement of chemical science and its applications in various fields, including materials science, biochemistry, and medicinal chemistry.

在有机化学领域，理解分子的结构和性质对于预测它们在各种反应中的行为至关重要。化学家们经常遇到的一个重要特征是环状结构内双键的存在。在这些特征中，术语内环双键指的是位于分子环系统内部的双键。这个概念至关重要，因为它影响着化合物的稳定性、反应性和整体特性。为了更好地理解内环双键的重要性，有必要将其与其对应物——外环双键进行比较。外环双键位于环状结构外部，这可能导致不同的化学性质和反应模式。例如，含有内环双键的化合物通常表现出独特的构象偏好，并且可以参与某些反应，这些反应对于仅具有外环双键的化合物来说是不可用的。一个经典的包含内环双键的分子例子是环己烯，其中双键是环状结构的一部分。这个双键的存在影响了分子的几何形状，使其比仅具有单键的环烷烃（环烷烃）更具反应性。这种增加的反应性通常在合成有机化学中被利用，通过各种反应（例如亲电加成）来创建更复杂的分子。内环双键的稳定性也可能受到立体效应和电子效应等因素的影响。在某些情况下，环的大小会影响双键所经历的应变，从而导致稳定性的不同程度。例如，小环可能引入角应变，这可能使内环双键不稳定，从而使化合物更具反应性。相反，较大的环可能更舒适地容纳双键，从而导致更稳定的结构。此外，与内环双键相关的立体化学在确定分子的物理和化学性质方面发挥着重要作用。围绕双键的取代基的方向可以导致顺式或反式异构体，每种异构体都具有不同的特性。在药物设计中，理解这些异构形式对于化学家至关重要，因为药物的活性可能严重依赖于其三维排列。总之，内环双键的概念在有机化学中是基础性的，影响着环状化合物的反应性、稳定性和性质。通过研究这些键，化学家可以更好地预测分子在反应中的行为，并利用这些知识合成新化合物。随着研究的不断发展，对内环双键的理解无疑将在化学科学及其在材料科学、生物化学和药物化学等各个领域的应用中发挥关键作用。