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Constructing Crystalline Covalent Organic Frameworks from Chiral Building Blocks.

Hai-Sen Xu1, San-Yuan Ding1, Wan-Kai An1

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Researchers developed a straightforward method to create chiral-functionalized covalent organic frameworks (COFs). These novel porous materials, LZU-72 and LZU-76, demonstrate robustness and high activity as heterogeneous organocatalysts.

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Catalysis

Background:

  • Covalent organic frameworks (COFs) are crystalline porous materials built from organic units.
  • Synthesizing functional COFs that are both crystalline and possess desired properties remains challenging.
  • Chiral COFs are particularly interesting for asymmetric catalysis but their construction is complex.

Purpose of the Study:

  • To develop a facile strategy for constructing chiral-functionalized COFs.
  • To synthesize and characterize novel chiral COFs using a specific rigid scaffold.
  • To evaluate the catalytic activity of the synthesized chiral COFs as heterogeneous organocatalysts.

Main Methods:

  • Design and synthesis of a rigid scaffold, 4,4'-(1H-benzo[d]imidazole-4,7-diyl)dianiline (2).
  • Synthesis of a chiral building block, (S)-4,4'-(2-(pyrrolidin-2-yl)-1H-benzo[d]imidazole-4,7-diyl)dianiline (3), incorporating a chiral moiety.
  • Utilizing the chiral building block to construct two chiral COFs, LZU-72 and LZU-76, via covalent assembly.

Main Results:

  • Successful synthesis of the rigid scaffold and the chiral pyrrolidine-embedded building block.
  • Direct construction of two novel chiral COFs, LZU-72 and LZU-76, demonstrating crystallinity and porosity.
  • Experimental validation of the structural robustness and high catalytic activity of the synthesized chiral COFs as heterogeneous organocatalysts.

Conclusions:

  • A facile strategy for direct construction of chiral-functionalized COFs from chiral building blocks has been established.
  • The synthesized chiral COFs (LZU-72 and LZU-76) are structurally robust.
  • These novel chiral COFs exhibit significant potential as highly active heterogeneous organocatalysts for various chemical transformations.