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Using IR vibrations to quantitatively describe and predict site-selectivity in multivariate Rh-catalyzed C-H
Elizabeth N Bess1, David M Guptill2, Huw M L Davies2
1Department of Chemistry , University of Utah , 315 South 1400 East , Salt Lake City , UT 84112 , USA .
Chemical Science
|February 7, 2018
Summary
Researchers identified key factors influencing selective C-H functionalization in toluene derivatives using rhodium catalysts. This work enables prediction of reaction outcomes for new substrate and reagent combinations.
Area of Science:
- Organic Chemistry
- Catalysis
- Chemical Synthesis
Background:
- Selective C-H functionalization is crucial but challenging due to similar C-H bonds.
- Rhodium catalysts like Rh2(DOSP)4 and Rh2(BPCP)4 show high selectivity in carbene insertions into toluene.
Purpose of the Study:
- To investigate the origins of high selectivity in Rh-catalyzed C-H functionalization of toluene derivatives.
- To develop a predictive model for site-selectivity based on substrate and reagent characteristics.
Main Methods:
- Systematic analysis of substrate and reagent features affecting selectivity.
- Utilized infrared vibrations and point charge analysis to describe selectivity variations.
- Developed a mathematical model to predict site-selectivity.
Main Results:
- Achieved selectivity ratios ranging from 20:1 to 610:1 for secondary/tertiary-to-primary benzylic C-H functionalization.
- Identified key system features that dictate site-selectivity.
- The developed model successfully predicts selectivity for new combinations.
Conclusions:
- Understanding the interplay of substrate and catalyst features is key to controlling C-H functionalization selectivity.
- The developed mathematical model offers a valuable tool for predicting and optimizing selective C-H functionalization reactions.
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