C(sp³)-F Adsorption Implicated for Reductive Activation at Ag Electrodes

Area of Science:

• Electrochemistry
• Organic Chemistry
• Materials Science

Background:

• Reductive activation of carbon-halogen bonds is crucial for synthesizing fluorinated compounds.
• Electrochemical reductive activation of C-Cl, C-Br, and C-I bonds at silver electrodes is well-understood.
• Experimental evidence for surface-mediated reductive C-F bond activation at silver is limited.

Purpose of the Study:

• To investigate the adsorption of organic fluorides on polarized silver electrodes.
• To explore the electrochemical reductive activation of C-F bonds at silver electrodes.
• To compare the behavior of organic fluorides with other organic halides at silver surfaces.

Main Methods:

• Utilized spectroscopic techniques (e.g., surface-sensitive, in situ spectroscopy) to detect adsorption.
• Employed voltammetry to study electrochemical reactions and compare electrode performance.
• Compared nitrile-tagged benzylic bromide, chloride, and fluoride substrates with a non-halogenated analog.

Main Results:

• Provided experimental evidence for the adsorption of organic fluorides on polarized silver electrodes.
• Observed enhanced reductive activation of organic fluorides at silver electrodes compared to glassy carbon.
• Spectroscopic and voltammetric data confirmed adsorption prior to charge transfer.

Conclusions:

• Organic fluoride adsorption at electrified silver surfaces is feasible.
• This adsorption facilitates reductive C-F bond activation, opening new electroorganic synthesis pathways.
• Findings encourage the design of electrodes that leverage surface interactions for advanced electroorganic methods.