Metal-Free Photochemical Olefin Isomerization of Unsaturated Ketones via 1,5-Hydrogen Atom Transfer

Rajendran Manikandan, Ravindra S. Phatake, N. Gabriel Lemcoff

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The photochemical isomerization of α,β- to β,γ-unsaturated ketones through a 1,5-hydrogen atom transfer mechanism under mild conditions with high efficiency and selectivity is reported. The reaction is carried out in the absence of metal catalysts or other additives, and its stereoselectivity can be tuned by selecting appropriate solvent mixtures. The reaction‘s scope and tolerance towards functional groups, including light-sensitive halogens, free acids and alcohols, were studied, providing reliable access to a wide variety of β,γ-unsaturated ketones. This methodology details the deconjugation of a wide range of unsaturated ketones and, when combined with olefin metathesis, provides an efficient process for either dehomologation or one-carbon double-bond migration of terminal alkenes.

Original languageEnglish
Article numbere202200634
JournalChemistry - A European Journal
Issue number29
StatePublished - 19 May 2022


  • 1,5-hydrogen atom transfer
  • dehomologation
  • olefin metathesis
  • olefin migration
  • photoisomerization

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry


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