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To fine\u2010tune the catalytic performance both sterically and electronically, various substituents (chloro, triflate, and bis(trimethylsilyl)amino groups) were introduced at the tin center, generating structurally diverse stannylenes. The molecular structures of these stannylenes were confirmed by multinuclear NMR spectroscopy and single\u2010crystal X\u2010ray diffraction analysis. The hydroboration of carbonyl compounds catalyzed by these stannylenes proceeded under mild reaction conditions, affording the corresponding boryl esters in excellent yields with high chemoselectivity. Notably, bis(trimethylsilyl)aminostannylene exhibited outstanding catalytic efficiency, enabling hydroboration with a minimal catalyst loading of 0.01 mol% for aldehydes and 0.1 mol% for ketones, and was tolerant of a wide range of substrates, including sterically hindered and electronically diverse carbonyl compounds. Furthermore, in the hydroboration of imines, the reaction proceeded efficiently with just 5 mol% catalyst, furnishing the corresponding borylamines in high yields. Based on stoichiometric experiments, we propose a plausible catalytic cycle for stannylene\u2010mediated hydroboration.<\/jats:p>","DOI":"10.1002\/chem.202501396","type":"journal-article","created":{"date-parts":[[2025,4,29]],"date-time":"2025-04-29T07:55:12Z","timestamp":1745913312000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Stannylenes Bearing an Amino\u2010Linked NHC Ligand as Efficient Catalysts for Hydroboration of Carbonyls and Imines"],"prefix":"10.1002","volume":"31","author":[{"given":"Yoshiki","family":"Kobayashi","sequence":"first","affiliation":[{"name":"Department of Chemistry Graduate School of Science and Engineering Saitama University  225, Shimo\u2010okubo Sakura\u2010ku Saitama 338\u20108570 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kazuki","family":"Nakaya","sequence":"additional","affiliation":[{"name":"Department of Chemistry Graduate School of Science and 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