Porous Aromatic Frameworks for Size-Selective Halogenation of Aryl Compounds

Area of Science:

• Organic Chemistry
• Materials Science
• Supramolecular Chemistry

Background:

• Organic halides are crucial building blocks in agrochemicals, molecular recognition, and materials science.
• Selective synthesis of organic halides is challenging due to multiple reactive sites on aryl fragments.

Purpose of the Study:

• To develop a novel porous material for selective organic halide synthesis.
• To functionalize a porous aromatic framework (PAF) with cyclodextrins (CDs) for regioselective reactions.

Main Methods:

• Preparation of a fully fluorinated porous aromatic framework (PAF).
• Decoration of the PAF with different cyclodextrins (CDs).
• Testing the CD-PAF material for selective chlorination and bromination of aryl compounds.

Main Results:

• The synthesized CD-PAF materials demonstrated high selectivity for para-substituted organic halides.
• Selectivity increased with decreasing substrate size, showing size-dependent recognition.
• The CD-PAFs exhibited stability and reusability in long-term chlorination and bromination reactions.

Conclusions:

• The novel CD-PAF material offers a promising strategy for the regioselective synthesis of organic halides.
• This approach addresses limitations in synthesizing complex aryl compounds, enhancing their utility in various applications.
• The material's hierarchical porosity and -C-F bonds facilitate functionalization and selective reactions.