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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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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

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不是如此 生物对应化学

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
概括

生物直角化学可以在生物系统中进行选择性分子标记. 然而,像反应动力学和选择性这样的挑战需要进一步的研究,以便在生物学和医学中得到更广泛的应用.

科学领域:

  • 生物对角化学
  • 化学生物学
  • 分子成像

背景情况:

  • 生物直角化学在复杂的生物系统中提供了对生物分子的选择性和非侵入性标记.
  • 它已经推进了细胞过程,蛋白质动力学和分子相互作用的研究.
  • 目前的局限性包括低于最佳的反应动力学,生物相容性问题以及需要更多的正交反应.

研究的目的:

  • 提供对被归类为生物直角反应的见解.
  • 突出目前生物对角化学的挑战和局限性.
  • 讨论生物对角化学的潜力和未来方向.

主要方法:

  • 对生物对等反应的文献综述.
  • 分析常见生物对等化学物质的选择性和反应性.
  • 讨论反应动力学,生物相容性和正交性方面的挑战.

主要成果:

  • 生物正交化学是研究生物系统的强大工具.
  • 现有的生物直角反应可能缺乏添加剂或催化剂的选择性.
  • 需要进一步开发以改善反应动力学,生物相容性和正交性.

结论:

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  • 生物对角化学具有巨大的潜力,
  • 应对当前的挑战对于实现生物直角工具的全部潜力至关重要.
  • 为了开发更强大和选择性的生物对角反应,需要继续进行研究.