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Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.0K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
1.0K
Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview01:27

Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview

1.7K
Wilhelm Rudolph Fittig discovered the pinacol coupling reaction in 1859. It is a radical dimerization reaction and involves the reductive coupling of aldehydes or ketones in the presence of hydrocarbon solvent to yield vicinal diols.
1.7K
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

46.4K
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
46.4K
Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

31.7K
sp3d and sp3d 2 Hybridization
31.7K
Valence Bond Theory and Hybridized Orbitals02:38

Valence Bond Theory and Hybridized Orbitals

18.7K
According to valence bond theory, a covalent bond results when: (1) an orbital on one atom overlaps an orbital on a second atom, and (2) the single electrons in each orbital combine to form an electron pair. The strength of a covalent bond depends on the extent of overlap of the orbitals involved. Maximum overlap is possible when the orbitals overlap on a direct line between the two nuclei.
A σ bond (single bond in a Lewis structure) is a covalent bond in which the electron density is...
18.7K
Hydrogen Bonds00:26

Hydrogen Bonds

120.6K
Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
120.6K

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相关实验视频

Updated: May 29, 2025

Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides
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统一的原子转移方法来构建邻近的功能.

Justin J Chang1, Munnu Kumar1, Misato Okamoto1

  • 1Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States.

Organic letters
|February 6, 2025
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的C-C键形成方法,使用乙烯酸试剂合成附近功能化的图案. 这种方法为复杂分子和乳合成提供了传统氧化方法的多功能替代方案.

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科学领域:

  • 有机化学 有机化学
  • 合成化学 合成化学

背景情况:

  • 副本功能化的图案是药品和天然产品的关键组成部分.
  • 目前的合成途径主要依赖于烯前体的氧化.
  • 对于这些基因的C-C键形成策略仍然相对未被探索.

研究的目的:

  • 开发一种统一和高效的合成方法来访问附近的功能化图案.
  • 建立一个补充的C-C键形成方法作为氧化反应的替代方案.
  • 为了证明开发的方法对复杂基板的广泛适用性.

主要方法:

  • 使用的乙试剂来自负担得起的,预先功能化的起始材料.
  • 开发了一种用于动机合成的新型C-C键形成反应.
  • 将该方法应用于多样化和分子复杂的基质.

主要成果:

  • 成功合成了一系列邻近功能化的图案.
  • 证明了新方法的广泛适用性和多功能性.
  • 展示了合产品在乳合成的单循环中的实用性.

结论:

  • 开发的基于乙的C-C键形成方法提供了一个有效的途径,以邻近功能化的图案.
  • 这种方法扩大了合成工具包,用于访问有价值的化学结构.
  • 这种方法促进了乳的高效合成,乳是重要的制药支架.