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Contrary to its neighboring elements in the periodic table, copper has been significantly overlooked in this domain, especially for C\uf8ffC bond formation. Herein, a mechanochemical method for synthesizing &gt;25 previously unreported conjugated allenynes\u2014a valuable scaffold in organic synthesis is presented\u2014through copper\u2010catalyzed homocoupling of propargylic esters. This approach utilizes ball milling to activate inexpensive zero\u2010valent copper under solvent\u2010minimized conditions, sourced from both powders and recycled waste materials, including wires and bolts, into catalytically active Cu<jats:sup>I<\/jats:sup> species under aerobic conditions. The synthetic utility of the synthesized compounds is showcased through an unprecedented rhodium\u2010catalyzed cyclocarbonylation and a gold\u2010catalyzed cyclization reaction.<\/jats:p>","DOI":"10.1002\/cssc.202500211","type":"journal-article","created":{"date-parts":[[2025,4,22]],"date-time":"2025-04-22T09:09:18Z","timestamp":1745312958000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Mechanochemical Aerobic Activation of Metallic Copper for the Synthesis of 1,4\u2010Allenynes"],"prefix":"10.1002","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7781-2064","authenticated-orcid":false,"given":"Ana M.","family":"Constantin","sequence":"first","affiliation":[{"name":"Department of ChemistryLife Sciences and Environmental Sustainability University of Parma  Parco Area delle Scienze 17\/A 43124 Parma 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