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This has, until now, been particularly true for NHC-stabilised stannylenes, with no exceptions reported thus far. Herein, we demonstrate that the combination of heteroleptic terphenyl-\/amido-based stannylenes and tetra-alkyl substituted NHCs renders the corresponding NHC-ligated stannylenes highly reactive, yet isolable. In solution, this induces sterically controlled inter- and intramolecular C(sp<jats:sup>3<\/jats:sup>)\u2013H bond scissions, resulting in the selective formation of stannylene metallocycles that depend on both the NHC source and the <jats:italic>meta<\/jats:italic>-terphenyl ligand coordinated to tin.<\/jats:p>","DOI":"10.1038\/s41467-025-57907-2","type":"journal-article","created":{"date-parts":[[2025,3,18]],"date-time":"2025-03-18T14:52:32Z","timestamp":1742309552000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Carbene-activated stannylenes to access selective C(sp3)\u2013H bond scission at the steric limit"],"prefix":"10.1038","volume":"16","author":[{"given":"Jennifer","family":"Klaucke","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-4498-3006","authenticated-orcid":false,"given":"Navutheya","family":"Sinthathurai","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-8865-3254","authenticated-orcid":false,"given":"Christopher","family":"Golz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9556-6450","authenticated-orcid":false,"given":"Oliver P. 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