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High-Yielding Syntheses of Crown Ether-Based Pyridyl Cryptands
Terry L Price1, Hanlie R Wessels1, Carla Slebodnick1
1Department of Chemistry and Macromolecules and Interfaces Institute, Virginia Tech , Blacksburg, Virginia 24061, United States.
This study reports a fast and efficient pyridinium bis(trifluoromethylsulfonyl)imide (PyTFSI)-templated synthesis for 2,6-pyridyl cryptands. This method yields gram quantities of powerful cryptand hosts, simplifying their accessibility.
Area of Science:
- Supramolecular Chemistry
- Organic Synthesis
Background:
- Cryptands are macrocyclic compounds with complex three-dimensional structures.
- Templated synthesis offers a route to efficiently construct these complex molecules.
Purpose of the Study:
- To develop a rapid and high-yielding templated synthesis for 2,6-pyridyl cryptands.
- To make gram quantities of cryptand hosts readily available.
Main Methods:
- Utilizing pyridinium bis(trifluoromethylsulfonyl)imide (PyTFSI) as a template.
- Employing a 12-hour synthesis protocol without a syringe pump.
- Synthesizing various 2,6-pyridyl cryptands including cis(4,4')-dibenzo-30-crown-10 and its derivatives.
Main Results:
- Achieved high yields (up to 89%) for several cryptands (3a, 3b, 5, 9) in just 12 hours.
- Demonstrated a faster, high-yielding templation method compared to previous techniques.
- Observed lower yields for cryptands 7 and 11, suggesting less effective templation in those specific cases.
Conclusions:
- The PyTFSI-templated synthesis provides a rapid and efficient route to valuable 2,6-pyridyl cryptand hosts.
- This protocol significantly enhances the accessibility of cryptand compounds in gram quantities.
- The method is a valuable addition to the synthesis of dibenzo crown ethers and related host molecules.
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