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Area of Science:

  • Electrochemistry
  • Organic Synthesis

Background:

  • Electrosynthetic methods are often limited by their potential reaction window, restricting functional group compatibility.
  • Redox-labile functional groups can be incompatible with traditional electrosynthesis due to potential window limitations.

Purpose of the Study:

  • To demonstrate that alternating current (AC) electrolysis can overcome potential window-limited functional group compatibility.
  • To explore the use of AC electrolysis for alkene heterodifunctionalization, tolerating redox-labile functional groups.

Main Methods:

  • Utilized alternating current (AC) electrolysis for alkene heterodifunctionalization.
  • Designed and demonstrated AC-driven reactions for sequential chloro- and bromotrifluoromethylation, and chlorosulfonylation.
  • Employed cyclic voltammetry to study the reaction mechanism and product yield limitations.

Main Results:

  • AC electrolysis successfully enabled sequential functionalization of alkenes, tolerating redox-labile groups like pyrrole, quinone, and aryl thioether.
  • The oscillating redox environment in AC electrolysis allows for regeneration of redox-active intermediates.
  • Product yield was found to be limited by the extent of starting material regeneration during redox cycling.

Conclusions:

  • AC electrolysis offers a novel approach to enhance functional group compatibility in electrosynthesis.
  • The findings suggest that AC electrolysis can be used to synthesize complex molecules with previously incompatible functional groups.
  • Product yields in AC electrolysis can potentially be predicted from cyclic voltammetry data.