Ceramic boron carbonitrides for unlocking organic halides with visible light

Area of Science:

• Materials Science
• Organic Chemistry
• Photocatalysis

Background:

• Photochemistry offers sustainable organic synthesis via radical intermediates.
• Efficient, stable, and recyclable heterogeneous photocatalysts are crucial but limited.
• Boron carbonitride (BCN) ceramics are explored as a novel photocatalytic system.

Purpose of the Study:

• To investigate BCN ceramics as metal-free photocatalysts for organic transformations.
• To demonstrate the reduction of organic halides and subsequent cross-coupling reactions.
• To assess the stability and recyclability of the BCN photocatalyst.

Main Methods:

• Visible light irradiation of organic halides with BCN ceramics.
• Mesolytic carbon-halogen (C-X) bond cleavage.
• Analysis of cross-coupling reactions forming C-H, C-C, and C-S bonds.

Main Results:

• BCN effectively reduces organic halides (aryl, heteroaryl, alkyl) under visible light.
• Cross-coupling reactions introduce H, aryl, and sulfonyl groups onto arenes and heteroarenes.
• The BCN photocatalyst is stable, recyclable for five cycles, and tolerant to various substituents.

Conclusions:

• BCN ceramics provide a sustainable, metal-free photocatalytic system for organic synthesis.
• This approach enables efficient C-X bond cleavage and functionalization under mild conditions.
• The metal-free, inexpensive, and stable nature of BCN opens new avenues for light-driven organic catalysis.