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相关概念视频

Measuring Reaction Rates03:09

Measuring Reaction Rates

Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical field in...
Relative Strengths of Conjugate Acid-Base Pairs02:29

Relative Strengths of Conjugate Acid-Base Pairs

Brønsted-Lowry acid-base chemistry is the transfer of protons; thus, logic suggests a relation between the relative strengths of conjugate acid-base pairs. The strength of an acid or base is quantified in its ionization constant, Ka or Kb, which represents the extent of the acid or base ionization reaction. For the conjugate acid-base pair HA / A−, the ionization equilibrium equations and ionization constant expressions are

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相关实验视频

Updated: Jun 24, 2026

Probing High-density Functional Protein Microarrays to Detect Protein-protein Interactions
08:07

Probing High-density Functional Protein Microarrays to Detect Protein-protein Interactions

Published on: August 2, 2015

在Pauson-Khand反应上进行密度功能研究.

M Yamanaka1, E Nakamura

  • 1Department of Chemistry, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.

Journal of the American Chemical Society
|July 18, 2001
PubMed
概括

使用密度函数理论研究了PausonKhand反应,一种催化合成的环,密度函数理论. 这项研究阐明了反应途径,揭示了关键步骤和催化剂在确定立体化学中的作用.

科学领域:

  • 有机金属化学 有机金属化学
  • 催化剂是一种催化剂.
  • 有机合成 有机合成

背景情况:

  • 休息Khand反应是至关重要的合成路径,循环.
  • 在这种转化过程中,通常使用催化剂.
  • 了解反应机制对于优化至关重要.

研究的目的:

  • 阐明PausonKhand反应的详细反应路径.
  • 研究中间体和过渡状态的结构和能量.
  • 确定催化剂在反应立体化学中的作用.

主要方法:

  • 使用了密度功能研究 (B3LYP/631LAN).
  • 进行了反应机制的计算建模.
  • 对中间体,过渡状态和能量进行了分析.

主要成果:

  • 帕森·坎德反应通过烯插入,CO插入和还原性消除进行.
  • 氨酸插入是速度决定和立体化学定义的步骤.
  • 催化剂影响反应的立体化学和能量学.

结论:

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PIP-on-a-chip: A Label-free Study of Protein-phosphoinositide Interactions

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High-Resolution Neutron Spectroscopy to Study Picosecond-Nanosecond Dynamics of Proteins and Hydration Water
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High-Resolution Neutron Spectroscopy to Study Picosecond-Nanosecond Dynamics of Proteins and Hydration Water

Published on: April 28, 2022

相关实验视频

Last Updated: Jun 24, 2026

Probing High-density Functional Protein Microarrays to Detect Protein-protein Interactions
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Probing High-density Functional Protein Microarrays to Detect Protein-protein Interactions

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PIP-on-a-chip: A Label-free Study of Protein-phosphoinositide Interactions
10:58

PIP-on-a-chip: A Label-free Study of Protein-phosphoinositide Interactions

Published on: July 27, 2017

High-Resolution Neutron Spectroscopy to Study Picosecond-Nanosecond Dynamics of Proteins and Hydration Water
08:48

High-Resolution Neutron Spectroscopy to Study Picosecond-Nanosecond Dynamics of Proteins and Hydration Water

Published on: April 28, 2022

  • 这项研究为PausonKhand反应机制提供了前所未有的见解.
  • 这些发现强调了催化剂在控制反应结果方面的关键作用.
  • 这项计算研究为设计改进的催化系统提供了基础.