Visible‐Light Mediated [4+2] Annulation of o‐Alkynylated ConjugateChalcones for Synthesis of 3,4‐Disubstituted‐Fluorenones

The method of photochemical [4+2] annulation of triplet states 1,6‐dieneynes to fluorenones via energy transfer (EnT) process under visible light irradiation is introduced. The EnT process between rose bengal and substrate is well supported by Stern–Volmer experiments. Control experiments and radical scavenging studies are well supported to rationale the reaction mechanism. This protocol showed high functional group tolerance and high atom economy.

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Publication Details

Journal
Advanced Synthesis & Catalysis
Published
2025-08-14
DOI
https://doi.org/10.1002/adsc.70074
Primary Topic
Advanced Electron Microscopy Techniques and Applications
Type
article
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article

Visible‐Light Mediated [4+2] Annulation of o‐Alkynylated ConjugateChalcones for Synthesis of 3,4‐Disubstituted‐Fluorenones

Advanced Synthesis & Catalysis
Advanced Electron Microscopy Techniques and Applications
article

Visible‐Light Mediated [4+2] Annulation of o‐Alkynylated ConjugateChalcones for Synthesis of 3,4‐Disubstituted‐Fluorenones

article en

Abstract

The method of photochemical [4+2] annulation of triplet states 1,6‐dieneynes to fluorenones via energy transfer (EnT) process under visible light irradiation is introduced. The EnT process between rose bengal and substrate is well supported by Stern–Volmer experiments. Control experiments and radical scavenging studies are well supported to rationale the reaction mechanism. This protocol showed high functional group tolerance and high atom economy.

Advanced Synthesis & Catalysis
University of Madras (IN)
Affordable and clean energy
Openalex Percentile: Top 51%
Advanced Electron Microscopy Techniques and Applications
DOISourceOpenAlex
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Visible‐Light Mediated [4+2] Annulation of o‐Alkynylated ConjugateChalcones for Synthesis of 3,4‐Disubstituted‐Fluorenones · Advanced Synthesis & Catalysis (2025) | TGRS Research Map | TGRS