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A crystalline doubly oxidized carbene.

Ying Kai Loh1, Mohand Melaimi2, Milan Gembicky2

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Researchers synthesized a doubly oxidized carbene (R2C2+), an octet-defying species, by removing non-bonding electrons from a carbene. This discovery opens doors for new chemical compounds and applications.

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Area of Science:

  • Organic Chemistry
  • Main group chemistry

Background:

  • Carbon chemistry typically follows the octet rule, but exceptions like radicals, carbocations, and carbenes exist.
  • Carbenes are versatile molecules with applications in materials and medicine.

Purpose of the Study:

  • To synthesize and characterize a doubly oxidized carbene (R2C2+).
  • To explore the electronic properties and stability of this novel carbene species.

Main Methods:

  • A two-electron oxidation and oxide-ion abstraction sequence was employed.
  • Bulky, strong electron-donating substituents were used for stabilization and protection.

Main Results:

  • A crystalline doubly oxidized carbene (R2C2+) was successfully synthesized.
  • The dicoordinate carbon center exhibits significant electrophilicity and vacant orbitals despite charge delocalization.
  • The parent carbene was regenerated through a two-electron reduction and deprotonation sequence.

Conclusions:

  • Doubly oxidized carbenes can be synthesized and stabilized.
  • The use of specific substituents is key to achieving electronic stabilization and steric protection.
  • This work expands the scope of carbene chemistry and enables the isolation of diverse doubly oxidized carbene species.