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Related Concept Videos

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

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The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Reduction of Alkenes: Catalytic Hydrogenation02:13

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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
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Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

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Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
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Acid-Catalyzed α-Halogenation of Aldehydes and Ketones01:21

Acid-Catalyzed α-Halogenation of Aldehydes and Ketones

3.6K
By replacing an α-hydrogen with a halogen, acid-catalyzed α-halogenation of aldehydes or ketones yields a monohalogenated product
In the first step of the mechanism, the acid protonates the carbonyl oxygen resulting in a resonance-stabilized cation, which subsequently loses an α-hydrogen to form an enol tautomer. The C=C bond in an enol is highly nucleophilic because of the electron-donating nature of the –OH group. Consequently, the double bond attacks an electrophilic halogen to form a...
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Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule02:17

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

13.8K
If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
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Related Experiment Video

Updated: May 29, 2025

Light-driven Enzymatic Decarboxylation
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Light-driven Enzymatic Decarboxylation

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Enantioselective Decarboxylative Hydrogen-Atom Transfer Reaction.

Yugui Xu1, Chaoren Shen1,2, Kaiwu Dong1,2

  • 1State Key Laboratory of Petroleum Molecular & Process Engineering, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China.

Journal of the American Chemical Society
|February 6, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel organocatalyzed method for enantioselective decarboxylative reduction. The new protocol efficiently produces chiral 3-substituted indolines from carboxylic acids with high stereoselectivity.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Direct enantioselective decarboxylative transformations are crucial for synthesizing complex molecules.
  • Developing efficient catalytic systems for such reactions remains a significant challenge in organic synthesis.

Purpose of the Study:

  • To establish an unprecedented organocatalyzed protocol for enantioconvergent decarboxylative reduction.
  • To demonstrate the utility of dual catalysis involving photoredox and thiol catalysis for asymmetric transformations.

Main Methods:

  • Utilized dual catalysis combining photoredox-mediated radical generation and thiol-catalyzed asymmetric hydrogen-atom transfer.
  • Applied the developed protocol to various carboxylic acids for hydrodecarboxylation.

Main Results:

  • Achieved the synthesis of a diverse range of chiral 3-substituted indolines.
  • Obtained moderate to excellent yields with high enantioselectivities for the target compounds.

Conclusions:

  • The developed dual catalytic system provides a powerful and efficient method for asymmetric hydrodecarboxylation.
  • This protocol offers a valuable new tool for constructing enantiomerically enriched indolines and related molecules.