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1,3-Diethynylallenes: New Modules for Three-Dimensional Acetylenic Scaffolding
Robert C Livingston1, Liam R Cox1, Volker Gramlich2
1Laboratorium für Organische Chemie, ETH-Zentrum Universitätstrasse 16, 8092 Zürich (Switzerland) Fax: (+41) 1-632-1109.
Angewandte Chemie (International Ed. in English)
|May 2, 2018
Summary
Researchers created novel 1,3-diethynylallenes using palladium-catalyzed cross-coupling. These carbon-rich molecules can form helical polymers, expanding materials science possibilities.
Area of Science:
- Organic Chemistry
- Materials Science
- Polymer Chemistry
Background:
- Palladium-catalyzed cross-coupling reactions are vital in organic synthesis.
- Allenes are versatile building blocks in organic chemistry.
- Helical polymers offer unique structural and electronic properties.
Purpose of the Study:
- To synthesize the first 1,3-diethynylallenes.
- To explore the potential of these allenes as monomers for novel polymers.
- To investigate the formation of helical structures from these new modules.
Main Methods:
- Regioselective Pd(0)-catalyzed cross-coupling of bispropargylic precursors with silyl-protected alkynes.
- Synthesis of 1,3-diethynylallenes.
- Oxidative oligomerization of enantiomerically pure allenes.
Main Results:
- Successful synthesis of the first 1,3-diethynylallenes.
- Demonstration of regioselective cross-coupling.
- Enantiomerically pure allenes were obtained.
- Potential for oxidative oligomerization into helical polymers was shown.
Conclusions:
- 1,3-diethynylallenes represent a new class of carbon-rich building blocks.
- These allenes can be accessed through palladium-catalyzed cross-coupling.
- The synthesized allenes offer a pathway to novel helical oligomers and polymers.
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