Photocatalytic Eosin Y Disproportionation as Driving Force for Terpene Cyclizations

URN to cite this document:: urn:nbn:de:bvb:355-epub-779057
DOI to cite this document:: 10.5283/epub.77905

Rittner, Thomas ; Lucht, Christian ; Rascón, Nicolas ; Abramov, Anton ; Hetzel, Lisa ; Stein, Christopher J. ; Gschwind, Ruth M.

; Nuernberger, Patrick

; Gulder, Tanja

License: Creative Commons Attribution 4.0
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Date of publication of this fulltext: 02 Oct 2025 06:18

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Abstract

A mechanistic paradigm for terpene cyclization driven by photocatalytic disproportionation of eosin Y in fluorinated alcohol media was discovered. By employing a 1:1 mixture of HFIP and PFTB, the neutral form of eosin Y (EH₂) undergoes efficient intersystem crossing to its triplet state, initiating hydrogen atom transfer (HAT) with ground-state EH₂. This generates two radicals, EH• and EH₃•, with ...