Methoxy-directed aryl-to-aryl 1,3-rhodium migration
Jing Zhang1, Jun-Feng Liu, Angel Ugrinov
1Department of Chemistry and Biochemistry, North Dakota State University , Fargo, North Dakota 58102, United States.
This study details a unique 1,3-rhodium migration in a Rh(I) complex, enabling meta-selective C-C bond formation via decarboxylative conjugate addition and C-H activation.
Area of Science:
- Organometallic Chemistry
- Catalysis
- Organic Synthesis
Background:
- Through-space metal/hydrogen shift is a key strategy in transition-metal-catalyzed C-H bond activation.
- Rhodium(I) complexes are widely used catalysts in organic transformations.
Purpose of the Study:
- To synthesize and characterize a Rh(I) 2,6-dimethoxybenzoate complex.
- To investigate the mechanism of a novel 1,3-rhodium migration.
- To explore the application of this migration in Rh(I)-catalyzed reactions.
Main Methods:
- Synthesis and characterization of a Rh(I) complex.
- Stoichiometric rearrangement studies.
- Rh(I)-catalyzed decarboxylative conjugate addition.
- Deuterium-labeling studies.
Main Results:
- A Rh(I) 2,6-dimethoxybenzoate complex was synthesized and characterized.
- A highly unusual 1,3-rhodium migration (aryl-to-aryl 1,3-Rh/H shift) was observed.
- This shift enabled meta-selective C-C bond formation in a decarboxylative conjugate addition.
- Deuterium labeling revealed ortho-methoxy group involvement in C-H activation during protodecarboxylation.
Conclusions:
- The study demonstrates a novel 1,3-rhodium migration pathway.
- This pathway offers a new strategy for meta-selective functionalization via C-H activation.
- The findings expand the scope of rhodium-catalyzed reactions and C-H activation methodologies.
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