Remote functional group directed C-H activation by an Ir(iii) phenanthroline complex.

Area of Science:

• Organometallic Chemistry
• Catalysis
• Computational Chemistry

Background:

• C-H activation is crucial for functionalizing inert bonds.
• Iridium complexes are known catalysts for C-H activation.
• Controlling regioselectivity in remote C-H activation remains a challenge.

Purpose of the Study:

• To investigate the regioselectivity of C-H activation by an iridium(iii) phenanthroline complex.
• To explore the substrate-driven selectivity in gas-phase reactions.
• To elucidate the mechanistic origins of selectivity using DFT calculations.

Main Methods:

• Gas-phase C-H activation experiments using 1-butanol and 1-methoxybutane.
• Spectroscopic analysis of reaction products.
• Density Functional Theory (DFT) calculations to model reaction pathways and energetics.

Main Results:

• The iridium(iii) complex exhibited C-H activation at gamma and delta positions for both substrates.
• Nearly exclusive gamma-carbon activation was observed for 1-methoxybutane.
• DFT calculations provided insights into the electronic and steric factors governing selectivity.

Conclusions:

• The iridium(iii) phenanthroline complex demonstrates significant potential as a selective remote C-H activation agent.
• Substrate structure plays a key role in directing regioselectivity.
• Computational modeling is a valuable tool for understanding and predicting C-H activation selectivity.