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

Overview

Journal Chemistry

Specialty Chemistry

Date 2022 Mar 24

PMID 35325491

Authors

Rajendran Manikandan

Ravindra S Phatake

N Gabriel Lemcoff

Affiliations

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Abstract

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.

Citing Articles

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

Manikandan R, Phatake R, Lemcoff N Chemistry. 2022; 28(29):e202200634.

PMID: 35325491 PMC: 9321148. DOI: 10.1002/chem.202200634.

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