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We report that commercial, ligand-free Eu(OTf)3 coordinates N-phenylacylimidazole BCBs, enabling direct 420 nm absorption to access a BCB-derived diradical without external chromophores. This single platform enables strain-release [2\u03c3+2\u03c0] and [2\u03c3+3\u03c0] photocycloadditions with electron-poor and aryl alkenes and annulations with \u03b1-vinyl azides. Mechanistic studies, gram-scale synthesis, and a sonidegib bioisostere demonstrate broad utility for sp3-rich scaffold construction.<\/jats:p>","DOI":"10.1021\/acs.orglett.6c03660","type":"journal-article","created":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T16:01:47Z","timestamp":1790092907000},"page":"12441-12446","source":"Crossref","is-referenced-by-count":0,"title":["Ligand-Free\nEu(OTf)3-Enabled Photoactivation\nfor Strain-Release Photocycloadditions of Bicyclo[1.1.0]butanes with\nSubstituted Alkenes"],"prefix":"10.1021","volume":"28","author":[{"given":"Qiujie","family":"Qin","sequence":"first","affiliation":[{"name":"Shanghai University , , 99 Shangda Road , ,","place":["Shanghai, P. R. China, 200444"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sicong","family":"Tu","sequence":"additional","affiliation":[{"name":"Shanghai University , , 99 Shangda Road , ,","place":["Shanghai, P. R. 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