{
  "abstract": "Harnessing the reactivity of triplet biradicals to selectively access unconventional cycloaddition pathways remains a fundamental challenge in energy transfer (EnT) catalysis. Herein, we demonstrate that systematic variation of diene substitution can redirect the intrinsic [2+2] reactivity of non-symmetrical dienes towards highly selective [4+2] cycloaddition. Notably, incorporation of a traceless vicinal BPin group invokes a non-conventional [4+2] pathway providing polysubstituted cyclohexenes with excellent regio- and diastereoselectivity. Mechanistic and computational investigations reveal that A-1,3-strain and geometric isomerisation shape the conformational landscape of the triplet biradical, accounting for the observed divergent reactivity. These findings establish substitution-controlled excited-state conformational dynamics as a key parameter for directing EnT-mediated cycloadditions beyond conventional [2+2] reactivity.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 11,
  "authors": [
    {
      "name": "Hannah M. Kortman"
    },
    {
      "name": "Alessia Marrese"
    },
    {
      "name": "Aimara García-Camacho"
    },
    {
      "name": "Yu Jen Hsueh"
    },
    {
      "name": "Paul Aßmann"
    },
    {
      "name": "Hao Fang"
    },
    {
      "name": "Anja Wiesner"
    },
    {
      "name": "Peter H. Seeberger"
    },
    {
      "name": "Diego Sampedro"
    },
    {
      "name": "Ignacio Funes-Ardoiz",
      "orcid": "0000-0002-5843-9660"
    },
    {
      "name": "John James Molloy",
      "orcid": "0000-0001-5337-0353"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/eas1yfe3krh84.bib",
  "cited_by": 0,
  "doi": "10.26434/chemrxiv.15008339/v1",
  "fulltext_url": null,
  "id": "eas1yfe3krh84",
  "issns": [],
  "landing_url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008339/v1",
  "language": null,
  "licence": "CC-BY-NC",
  "licence_label": "CC BY-NC",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by-nc/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "1605|Radical Photochemical Reactions"
    ]
  ],
  "openalex": "W7208756994",
  "pdf_url": "https://chemrxiv.org/doi/pdf/10.26434/chemrxiv.15008339/v1",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-04",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/eas1yfe3krh84.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:17Z",
      "native_id": "10.26434/chemrxiv.15008339",
      "source": "chemrxiv",
      "url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008339/v2"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "openalex:1605|Radical Photochemical Reactions",
      "subfield": "organic"
    }
  ],
  "title": "Energy Transfer (EnT) Catalysed [4+2] Cycloaddition of Non-Symmetrical Dienes: From Mechanistic Anomaly to Fully Functional Reaction Pathway",
  "title_text": "Energy Transfer (EnT) Catalysed [4+2] Cycloaddition of Non-Symmetrical Dienes: From Mechanistic Anomaly to Fully Functional Reaction Pathway",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:17Z",
  "url": "https://research.draconitic.com/paper/eas1yfe3krh84",
  "venue": "ChemRxiv",
  "versions": []
}