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相关概念视频

Chirality02:25

Chirality

24.2K
Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
24.2K
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

5.7K
Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
5.7K
Chirality in Nature02:30

Chirality in Nature

13.4K
Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
13.4K
Prochirality02:05

Prochirality

3.8K
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
3.8K
Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

11.6K
Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
11.6K
¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons00:58

¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons

1.7K
Replacing each alpha-hydrogen in chloroethane by bromine (or a different functional group) yields a pair of enantiomers. Such protons are called prochiral or enantiotopic and are related by a mirror plane. Enantiotopic protons are chemically equivalent in an achiral environment. Because most proton NMR spectra are recorded using achiral solvents, enantiotopic hydrogens yield a single signal.
In chiral compounds such as 2-butanol, replacing the methylene hydrogens at C3 produces a pair of...
1.7K

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相关实验视频

Updated: Jun 27, 2025

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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希拉尔的提安特里尼斯 (Thianthrenes) 是一种的类型.

M John Plater1, William T A Harrison1

  • 1Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen AB24 3UE, UK.

International journal of molecular sciences
|April 27, 2024
PubMed
概括
此摘要是机器生成的。

基拉尔硫氧化物分析了绝对配置和稳定性. 射线晶体学证实二聚体硫氧化物在溶液中是稳定的,而不是像以前假设的那样相互转换.

关键词:
性硫氧化物 硫氧化物的配置配置配置.它们是 diastereoisomer 的组成部分.这意味着他们.解决方案的解决方案解决方案的解决方案.硫氧化硫化物是什么铁二烯 (Thianthrene) 是一种二烯.

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科学领域:

  • 有机化学 有机化学
  • 立体化学是一种立体化学.
  • 晶体学 晶体学是指结晶学.

背景情况:

  • 已知硫氧化物在某些条件下会经历种族化或表皮化.
  • 之前的研究表明,在溶液中的二聚体硫氧化物之间存在潜在的相互转化.
  • 提安烯衍生物为研究合硫氧化物行为提供了一个独特的支架.

研究的目的:

  • 为了确定两种硫酸的绝对配置和溶液稳定性.
  • 为了验证二聚体硫氧化物是否在溶液中相互转化.
  • 为了建立可靠的分离方法,这些奇拉化合物.

主要方法:

  • 使用X射线单晶结构测定来确定绝对配置.
  • 薄层染色学 (TLC) 和上的闪光染色学用于分离和分析.
  • 谱学方法被隐含地用于化合物表征 (尽管在抽象中没有详细说明).

主要成果:

  • 确定了两种蒂安二醇硫酸的绝对配置.
  • 已证实二聚体硫氧化物在溶液中是稳定的,并且没有相互转换.
  • 通过闪光染色学实现了二聚体的成功分离,尽管具有挑战性的共化 (背靠背的斑点).
  • 纯净的分离化合物在溶液中保持其完整性,作为TLC板上的单点.

结论:

  • 这项研究提供了具体的证据,证明这些特定的二聚体二二二硫酸盐在溶液中的相互转化.
  • 在这种系统中,X射线晶体学是一种可靠的方法来确定绝对配置.
  • 在二氧化上的闪光色谱是一种有效的技术,用于分离具有挑战性的二氧化硫化.