Ultrastable Copper Cluster Enables Highly Site-Selective and Chemoselective Carbocation C(sp³)-H and C(sp²)-H Bonds...

Area of Science:

• Catalysis
• Organic Chemistry
• Cluster Chemistry

Background:

• C-H functionalization is crucial for C-C bond formation but faces selectivity challenges.
• Complex molecules possess similar C-H bonds and reactive functional groups, complicating reactions.

Purpose of the Study:

• To develop a versatile copper cluster catalyst for site- and chemoselective C-H functionalization.
• To address limitations of traditional copper catalysts in complex organic synthesis.

Main Methods:

• Development of a stable copper cluster, Cu3NC(NHC), with dynamic catalytic sites.
• Utilizing Cu3NC(NHC) to form stabilized carbocations for C-H functionalization.
• Employing mechanistic studies and density functional theory (DFT) for analysis.

Main Results:

• The Cu3NC(NHC) catalyst achieved unprecedented site- and chemoselectivity in C(sp3)-H and C(sp2)-H bond functionalization.
• Turnover numbers (TON) reached up to 123,200, significantly improving catalytic efficiency.
• DFT studies confirmed that energy differences in key intermediates govern selectivity.

Conclusions:

• The Cu3NC(NHC) cluster offers a robust solution for selective C-H functionalization.
• This catalyst provides a versatile platform for optimizing reactions and advancing cluster-organic chemistry.
• The findings pave the way for innovative developments in synthetic organic chemistry.