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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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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.
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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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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.
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Homologative alkene difunctionalization.

Morgan Kim1, So Yeon Ahn1, Seongmin Kim1

  • 1Department of Chemistry, Seoul National University, Seoul, Republic of Korea.

Nature Chemistry
|January 7, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method for synthesizing homologous compounds by inserting a single carbon atom into alkenes. This approach simplifies the creation of diverse 1,3-difunctionalized molecules, valuable in medicinal chemistry.

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Medicinal Chemistry

Background:

  • Homologous series are crucial in chemistry but often require complex, individualized synthesis.
  • Current methods for preparing homologues lack efficiency and versatility.

Purpose of the Study:

  • To develop a streamlined strategy for synthesizing homologous compounds.
  • To enable direct routes for 1,3-difunctionalized products from alkenes.

Main Methods:

  • Integration of single-carbon insertion into alkene difunctionalization.
  • Utilizing a methylene dication reagent (iodomethylthianthrenium salt) for photocatalysis.
  • Formation of 1,3-dielectrophilic intermediates for nucleophile incorporation.

Main Results:

  • Successful redirection of alkene vicinal difunctionalization to 1,3-difunctionalization.
  • Demonstration of broad access to diverse 1,3-difunctionalized products, including azetidines, 1,3-diazides, and 1,3-dihalides.
  • High compatibility in pharmaceutical and late-stage synthesis settings.

Conclusions:

  • 'Homologative alkene difunctionalization' offers a powerful new synthetic platform.
  • Ubiquitous alkenes can be repurposed as key intermediates for novel 1,3-substitution patterns.
  • The developed method simplifies access to valuable homologous compounds.