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Achieving Moderate Pressures in Sealed Vessels Using Dry Ice As a Solid CO2 Source
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Achieving Moderate Pressures in Sealed Vessels Using Dry Ice As a Solid CO2 Source.

Mohit Kapoor1, Pratibha Chand-Thakuri1, Justin M Maxwell1

  • 1Department of Chemistry and Biochemistry, University of Toledo; School of Green Chemistry and Engineering, University of Toledo.

Journal of Visualized Experiments : Jove
|September 4, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a simple method using dry ice to create carbon dioxide (CO2) pressure for chemical reactions. This technique avoids special equipment and facilitates amine functionalization, simplifying synthetic chemistry.

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Area of Science:

  • Organic Chemistry
  • Synthetic Methodology
  • Green Chemistry

Background:

  • Organometallic reactions often require specialized equipment for precise pressure control.
  • Amine substrates are prone to oxidation during reactions, necessitating protective strategies.
  • Directing groups can improve reaction selectivity but often require additional removal steps.

Purpose of the Study:

  • To develop a general strategy for performing chemical reactions under mild to moderate carbon dioxide (CO2) pressure using dry ice.
  • To demonstrate the utility of CO2 as both a directing group and a passivating agent for amine substrates.
  • To enable facile C-H functionalization of aliphatic amines under accessible conditions.

Main Methods:

  • Utilizing dry ice to generate controlled CO2 pressure in reaction vessels.
  • Employing CO2 as a directing group to facilitate regioselective functionalization.
  • Passivating amine substrates with CO2 to prevent oxidative side reactions during organometallic catalysis.
  • Removing the CO2 directing group under vacuum post-reaction.

Main Results:

  • Successful implementation of a general strategy for reactions under CO2 pressure generated from dry ice.
  • Demonstration of CO2 acting as an effective directing group and passivating agent for amine substrates.
  • Facile gamma-C(sp3)-H arylation of aliphatic amines achieved under mild conditions.
  • Simplified purification due to the facile removal of the CO2 directing group.

Conclusions:

  • The presented strategy offers a practical and equipment-light approach to conducting reactions under CO2 pressure.
  • This method simplifies the synthesis of functionalized amines by integrating directing and passivating roles for CO2.
  • The technique holds potential for broad application in various amine-based synthetic transformations.