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Related Concept Videos

Solvating Effects02:12

Solvating Effects

7.3K
An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
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Solvents01:12

Solvents

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A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
A...
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Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
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SN2 Reaction: Stereochemistry02:23

SN2 Reaction: Stereochemistry

9.3K
In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not...
9.3K
Entropy and Solvation02:05

Entropy and Solvation

7.0K
The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
7.0K
SN2 Reaction: Mechanism02:27

SN2 Reaction: Mechanism

14.1K
The kinetic studies of SN2 reactions suggest an essential feature of its mechanism: it is a single-step process without intermediates. Here, both the nucleophile and the substrate participate in the rate-determining step.
The presence of the more electronegative halogen in the substrate creates a polarized carbon-halide bond. The halide pulls the electron cloud generating an electrophilic center at the carbon atom. Thus, the carbon atom carries a partial positive charge while the halide has a...
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Solvent Dictated Organic Transformations.

Tamanna Khandelia1, Pritishree Panigrahi1, Subhendu Ghosh1

  • 1Department of Chemistry, Indian Institute of Technology Guwahati, Assam, India.

Chemistry, an Asian Journal
|November 7, 2024
PubMed
Summary

Solvents are crucial for C-H activation in organic synthesis, influencing reactions chemically and energetically. This review details how various solvents facilitate diverse C-H activation pathways and transformations.

Keywords:
CagingElectron donor acceptor (EDA) complexPhotochemical reactionsSolvent-participationSolvent-switched

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Reaction Mechanisms

Background:

  • Solvents are essential reaction media in organic synthesis.
  • C-H activation is a powerful synthetic tool.
  • Solvents can significantly influence reaction outcomes and efficiency.

Purpose of the Study:

  • To review the role of solvents in organic transformations via C-H activation.
  • To highlight solvent-assisted mechanisms and substrate scope.
  • To categorize C-H activation strategies based on solvent involvement.

Main Methods:

  • Comprehensive literature review of C-H activation reactions.
  • Analysis of solvent effects on reaction profiles.
  • Classification of C-H activation based on solvent roles.

Main Results:

  • Detailed discussion of various solvents (e.g., THF, DCM, DMF, DMSO, TFE, HFIP) and their impact.
  • Exploration of solvent-switched divergent C-H activation.
  • Examination of C-H activation using solvents as coupling reagents or in complex formation.

Conclusions:

  • Solvents play a multifaceted role in C-H activation, beyond just being a medium.
  • Understanding solvent effects is key to optimizing C-H activation reactions.
  • Solvent assistance enables diverse transformations including divergent pathways and catalysis.