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Temporary or removable directing groups enable activation of unstrained C-C bonds
1West China School of Public Health and West China Fourth Hospital, and State Key Laboratory of Biotherapy, Sichuan University, Chengdu, 610041, China.
Researchers developed catalytic methods for activating unstrained carbon-carbon bonds using temporary directing groups. This breakthrough enables easier manipulation of organic molecules for diverse synthetic applications.
Area of Science:
- Organic Chemistry
- Catalysis
- Synthetic Methodology
Background:
- Carbon-carbon (C-C) bonds form the core of organic molecules.
- Activating C-C bonds typically requires strained substrates or permanent directing groups (DGs).
- Developing methods for less strained compounds is a significant challenge.
Purpose of the Study:
- To review catalytic approaches for activating unstrained C-C bonds.
- To highlight the role of temporary and removable directing groups (DGs).
- To showcase applications in synthesizing complex molecules.
Main Methods:
- Focus on catalytic activation of C-C bonds.
- Utilizes temporary and removable directing groups (DGs).
- Categorizes methods based on the nature of the DGs.
Main Results:
- Demonstrates successful activation of unstrained C-C bonds.
- Enables conversion to reactive metal-carbon bonds.
- Facilitates diverse downstream synthetic transformations.
Conclusions:
- Temporary and removable DGs offer an attractive strategy for C-C bond activation.
- These methods expand the scope of substrates for C-C bond manipulation.
- Applications in natural product and bioactive molecule synthesis are significant.
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ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3
ortho–para-Directing Deactivators: Halogens
meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H
Cycloaddition Reactions: MO Requirements for Thermal Activation
Directing Effect of Substituents: ortho–para-Directing Groups
Directing Effect of Substituents: meta-Directing Groups

