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Unlike previous methods, the current approach does not require the protection of alcohol, heating, transition metal catalysts, or solvents. The reaction mechanism is proposed based on deuterium labelling, step\u2010wise synthesis, and isolation of intermediates. The current protocol exhibits a broad substrate scope, high reaction yields, and enables gram\u2010scale synthesis. Besides, we also demonstrated the one\u2010pot cyclization of these allenes to obtain tetrahydroindoles and fused furans.\n                  <\/jats:p>","DOI":"10.1002\/chem.202503306","type":"journal-article","created":{"date-parts":[[2025,12,18]],"date-time":"2025-12-18T12:33:47Z","timestamp":1766061227000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Calcium\u2010Catalyzed Regioselective Synthesis of Trisubstituted Allenes From\n                    <i>sec<\/i>\n                    \u2010Propargyl Alcohols and Their Cyclizations"],"prefix":"10.1002","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6152-5861","authenticated-orcid":false,"given":"Srinivasarao","family":"Yaragorla","sequence":"first","affiliation":[{"name":"University of Hyderabad (an Institute of Eminence) P.O. 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