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Based on the N,N\u2032\u2010chelating \u03b2\u2010diketiminato ligand (HNacNac), a new amido imidazoline\u20102\u2010imine ligand system (HAmIm) is presented, giving rise to the isolation of an exhaustive series of Lewis acid free, monomeric chalcogen B=X boranes with documented \u03c0\u2010bond character between boron and the chalcogen. The chalcogenoboranes are isoelectronic and isolobal to the respective ketones. The chemical behavior of the oxoborane (B=O) strongly resembles the classical carbonyl reactivity in C=O bonds. The improved stability provided by HAmIm arises from the formation of more\u2010stable five\u2010membered boron chelates versus the six\u2010membered NacNac analogues and from the imidazoline\u20102\u2010imine moiety providing enhanced \u03c3\u2010 and \u03c0\u2010donation. The HAmIm ligand class may supersede the widely employed NacNac system in certain applications.<\/jats:p>","DOI":"10.1002\/anie.202015553","type":"journal-article","created":{"date-parts":[[2020,11,30]],"date-time":"2020-11-30T03:04:10Z","timestamp":1606705450000},"page":"4633-4639","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":45,"title":["Superseding \u03b2\u2010Diketiminato Ligands: An Amido Imidazoline\u20102\u2010Imine Ligand Stabilizes the Exhaustive Series of B=X Boranes (X=O, S, Se, Te)"],"prefix":"10.1002","volume":"60","author":[{"given":"Hadi","family":"Dolati","sequence":"first","affiliation":[{"name":"Institute of Inorganic and Analytical Chemistry Technische Universit\u00e4t Braunschweig  Hagenring 30 38106 Braunschweig Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lars","family":"Denker","sequence":"additional","affiliation":[{"name":"Institute of Inorganic and Analytical Chemistry 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