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Based on control experiments, a plausible reaction pathway is proposed. This cascade process appears to involve a Cu(II)\u2010catalyzed tandem sequence: propargylic nucleophilic substitution of methanol, regioselective tetradehydro\u2010Diels\u2013Alder (TDDA) cycloaddition, and either a Meyer\u2013Schuster rearrangement or an elimination reaction. Furthermore, deuterium\u2010labeling experiments indicate that a strained cyclic allene intermediate is formed during the tetradehydro\u2010Diels\u2013Alder cycloaddition. This strained allene intermediate then undergoes isomerization to a benzene ring via proton transfer from the hydroxyl hydrogen of methanol, rather than through intramolecular hydrogen transfer at the vinyl position. Under mild conditions, a diverse range of valuable fluorenylidene derivatives can be efficiently synthesized.<\/jats:p>","DOI":"10.1002\/asia.70777","type":"journal-article","created":{"date-parts":[[2026,5,13]],"date-time":"2026-05-13T04:21:57Z","timestamp":1778646117000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Copper(II)\u2010Catalyzed Tandem Propargylic Nucleophilic Substitution\/Regioselective Tetradehydro\u2010Diels\u2013Alder\/Meyer\u2013Schuster Rearrangement or Elimination Reaction of Eneynols"],"prefix":"10.1002","volume":"21","author":[{"given":"Hang","family":"Ren","sequence":"first","affiliation":[{"name":"Zhejiang Key Laboratory of Advanced Catalysis and Adsorption Materials Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Institute of Advanced Fluorine\u2010Containing Materials Zhejiang Normal University  Jinhua 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