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The combination of lanthanide metals (lanthanum, dysprosium) with Lewis acids (AlCl\n                    <jats:sub>3<\/jats:sub>\n                    , LaI\n                    <jats:sub>3<\/jats:sub>\n                    ) allows the efficient regio\u2010 and stereoselective transformation of CF\n                    <jats:sub>3<\/jats:sub>\n                    \u2010benzofulvenes into a range of versatile difluoroalkenes proceeding via \u03f5,\u03f5\u2010difluoropentadienyl lanthanide or aluminium species. The reaction of these organometallic intermediates towards ketones and nitroalkenes is herein reported and analyzed in relation to previous studies on aldehydes. The influence of steric and electronic factors of the organic substrates but also of the lanthanide metals and Lewis acids on the regio and stereoselective reaction is highlighted and corroborated by in\u2010depth DFT studies. The resulting difluorinated homoallylic alcohols and nitroalkanes were further functionalized to new benzofulvenes and their reactivity explored.\n                  <\/jats:p>","DOI":"10.1002\/asia.202500071","type":"journal-article","created":{"date-parts":[[2025,3,13]],"date-time":"2025-03-13T08:14:31Z","timestamp":1741853671000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Lanthanide\u2010mediated Defluorinative Transformations of Trifluoromethylated Benzofulvenes: Access to Functionalized Difluoroalkenes and Mechanistic Insights"],"prefix":"10.1002","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3210-0036","authenticated-orcid":false,"given":"Tarun","family":"Kumar","sequence":"first","affiliation":[{"name":"ICGM, Univ Montpellier CNRS, ENSCM  34090 Montpellier France"},{"name":"Department of Chemistry Mohanlal Sukhadia University  Udaipur 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