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関連する概念動画

Regioselectivity and Stereochemistry of Hydroboration02:36

Regioselectivity and Stereochemistry of Hydroboration

8.0K
A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
8.0K
Stereoisomerism02:52

Stereoisomerism

11.7K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
11.7K
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

3.0K
Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
3.0K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.8K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
1.8K
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

2.4K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
2.4K
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

5.7K
All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
5.7K

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関連する実験動画

Updated: May 25, 2025

Microfluidic On-chip Capture-cycloaddition Reaction to Reversibly Immobilize Small Molecules or Multi-component Structures for Biosensor Applications
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Microfluidic On-chip Capture-cycloaddition Reaction to Reversibly Immobilize Small Molecules or Multi-component Structures for Biosensor Applications

Published on: September 23, 2013

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バイオ・オートゴーナル・ケミストリー

Dominik Schauenburg1,2, Tanja Weil1

  • 1Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.

Journal of the American Chemical Society
|February 28, 2025
PubMed
まとめ

バイオオートゴーナル化学は 生物学的システムにおける 選択的分子ラベリングを可能にします しかし,反応運動学や選択性などの課題は,生物学や医学におけるより広範な応用のためにさらなる研究が必要です.

科学分野:

  • バイオオートゴーナル化学
  • 化学生物学
  • 分子イメージング

背景:

  • バイオオートゴーナル化学は,複雑な生物系におけるバイオ分子に選択的かつ非侵襲的なラベリングを提供します.
  • 細胞のプロセス,タンパク質の動力学,分子相互作用の研究を進めてきました.
  • 現在の制限には,最適でない反応動力学,生物互換性問題,およびより直交的な反応の必要性があります.

研究 の 目的:

  • バイオオートホーガンとして分類された反応の洞察を提供するためです.
  • 現在のバイオオルトゴン化学の課題と限界を強調する.
  • バイオオートゴーナル化学の可能性と将来の方向性を議論する.

主な方法:

  • バイオオルトゴン反応に関する文献のレビュー.
  • 一般的なバイオオルトゴン化学の選択性と反応性の分析.
  • 反応動力学,生物互換性,正交性に関する課題の議論

主要な成果:

  • バイオオートゴーナル化学は 生物学的システムを研究するための強力なツールです
  • 既存のバイオオートゴーナル反応は,添加物や触媒で望ましい選択性を欠く可能性があります.
  • 反応運動,生物互換性,正交性を改善するためにさらなる開発が必要である.

さらに関連する動画

Bioorthogonal Chemical Imaging of Cell Metabolism Regulated by Aromatic Amino Acids
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Bioorthogonal Chemical Imaging of Cell Metabolism Regulated by Aromatic Amino Acids

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Preparation and Evaluation of 99mTc-labeled Tridentate Chelates for Pre-targeting Using Bioorthogonal Chemistry
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Preparation and Evaluation of 99mTc-labeled Tridentate Chelates for Pre-targeting Using Bioorthogonal Chemistry

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関連する実験動画

Last Updated: May 25, 2025

Microfluidic On-chip Capture-cycloaddition Reaction to Reversibly Immobilize Small Molecules or Multi-component Structures for Biosensor Applications
14:43

Microfluidic On-chip Capture-cycloaddition Reaction to Reversibly Immobilize Small Molecules or Multi-component Structures for Biosensor Applications

Published on: September 23, 2013

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Bioorthogonal Chemical Imaging of Cell Metabolism Regulated by Aromatic Amino Acids
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Bioorthogonal Chemical Imaging of Cell Metabolism Regulated by Aromatic Amino Acids

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Preparation and Evaluation of 99mTc-labeled Tridentate Chelates for Pre-targeting Using Bioorthogonal Chemistry
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Preparation and Evaluation of 99mTc-labeled Tridentate Chelates for Pre-targeting Using Bioorthogonal Chemistry

Published on: February 4, 2017

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結論:

  • バイオオートゴーナル化学は 生物学や医学の進歩に 大きな可能性を秘めています
  • バイオオートゴーナルツールの潜在力を最大限発揮するには,現在の課題に取り組むことが不可欠です.
  • より堅固で選択的な生物対位反応を開発するには,研究を続けることが必要です.