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Related Concept Videos

Preparation and Reactions of Thiols02:33

Preparation and Reactions of Thiols

7.6K
Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
7.6K
Reactions at the Benzylic Position: Halogenation01:11

Reactions at the Benzylic Position: Halogenation

3.6K
Benzylic halogenation takes place under conditions that favor radical reactions such as heat, light, or a free radical initiator like peroxide.
3.6K
Structure and Nomenclature of Thiols and Sulfides02:17

Structure and Nomenclature of Thiols and Sulfides

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Thiols and sulfides are sulfur analogs of alcohols and ethers, respectively, where the sulfur atom takes the place of the oxygen atom. Thus, thiols are generally represented as RSH, where R is an alkyl substituent and —SH is the functional group. On the other hand, in sulfides, the central sulfur atom is bonded to two hydrocarbon groups on either side. Depending upon the type of group, sulfides can be either symmetrical or asymmetrical. Both thiols and sulfides display a bent geometry,...
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Trigonometric Substitution01:23

Trigonometric Substitution

77
Trigonometric substitution is a technique used to simplify integrals that contain square root expressions involving quadratic forms. It is particularly effective when the integrand includes terms resembling those found in standard geometric equations, such as circles or ellipses.Molniya satellites follow highly elliptical orbits, repeatedly sweeping out the same regions of space as they revolve around Earth. To estimate the area enclosed by such an orbit, the path is modeled as an ellipse...
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Rationalizing Substitutions01:29

Rationalizing Substitutions

62
Integrals involving non-rational functions are often difficult to evaluate using standard techniques, especially when radicals appear in the integrand. Rationalizing substitution provides a systematic method for simplifying such integrals by converting them into rational forms that are easier to handle.Consider a rod whose linear mass density depends on a constant linear density, a characteristic length, and the distance from the left end of the rod. Determining the total mass requires...
62
Reactions at the Benzylic Position: Oxidation and Reduction00:59

Reactions at the Benzylic Position: Oxidation and Reduction

5.1K
The benzylic position describes the position of a carbon atom attached directly to a benzene ring. Benzene by itself does not undergo oxidation. In contrast, the benzylic carbon is quite reactive in the presence of strong oxidizing agents such as KMnO4 or H2CrO4. Therefore, alkylbenzenes are readily oxidized to benzoic acid, irrespective of the type of alkyl groups.
5.1K

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Synthesis and Bioconjugation of Thiol-Reactive Reagents for the Creation of Site-Selectively Modified Immunoconjugates
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Bioconjugation with Thiols by Benzylic Substitution.

Kenji Watanabe1, Takashi Ohshima1

  • 1Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|February 20, 2018
PubMed
Summary

This study introduces a novel benzylic substitution reaction that selectively modifies biomacromolecules like proteins under mild, aqueous conditions. The reaction preserves the biological activity of modified proteins, demonstrating its potential for bioconjugation.

Keywords:
bioconjugationnucleophilic substitutionpH-responsiveprotein modificationssulfur

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Area of Science:

  • Organic Chemistry
  • Biochemistry
  • Chemical Biology

Background:

  • Benzylic substitution reactions are crucial for chemical synthesis.
  • Modifying biomacromolecules often requires harsh conditions that can affect their function.
  • Developing mild and selective modification methods is essential for bioconjugation.

Purpose of the Study:

  • To develop a novel benzylic substitution reaction for modifying biomacromolecules.
  • To investigate the reaction mechanism and conditions for optimal selectivity.
  • To demonstrate the utility of the method on model proteins while preserving their bioactivity.

Main Methods:

  • Benzylic substitution of 3-indolyl(hydroxyl)acetate derivatives with thiols.
  • Reaction optimization in weakly acidic aqueous solutions near physiological pH.
  • Kinetic studies to determine reaction order and mechanism.
  • Modification of model proteins (lysozyme, insulin, trypsin, serum albumin).

Main Results:

  • Specific benzylic substitution occurred in the presence of amino, carboxy, and phosphate groups at pH < 7.
  • The reaction followed second-order kinetics, differing from the typical SN1 mechanism.
  • Model proteins were successfully functionalized without loss of catalytic activity (e.g., lysozyme).

Conclusions:

  • A novel, mild, and selective benzylic substitution method has been established.
  • The reaction is suitable for functionalizing biomacromolecules under physiological conditions.
  • The method preserves the biological activity of modified proteins, enabling applications in bioconjugation.