Journal
GREEN CHEMISTRY
Volume 25, Issue 13, Pages 5010-5023Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d3gc00931a
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Photochemistry has become increasingly important in organic synthesis and heterogeneous photocatalysts have advantages over traditional homogeneous photocatalysts in terms of production, separation, catalyst recycling, and stability. In this review, the development and advantages of a heterogeneous catalytic system for C-N bond formation as a typical coupling reaction are summarized. Important heterogeneous photocatalysts such as titanium dioxide, semiconductor quantum dots, covalent organic frameworks, and carbon nitrides are discussed in detail. The combination and electron transfer pathway between heterogeneous catalysts and transition-metal catalysts are the focus of this review. These advances not only apply to C-N coupling, but also extend to other coupling reactions.
Over the few decades, photochemistry has received great attention and become a powerful tool in organic synthesis. Heterogeneous photocatalysts present complementary advantages in production, separation, catalyst recycling, and stability compared to the traditional homogeneous photocatalysts. In this review, we choose C-N bond formation as a typical coupling reaction and summarize the development of a heterogeneous catalytic system and its advantages. Titanium dioxide, semiconductor quantum dots, covalent organic frameworks, and carbon nitrides are discussed in detail as important heterogeneous photocatalysts. The combination and electron transfer pathway between heterogeneous catalysts and transition-metal catalysts are the focus of this review. These advances are not only limited to the C-N coupling, but also extend to other coupling reactions.
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