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Coordinated benzene ligands can be neutral, di\u2010anionic or, often controversially discussed, even tetra\u2010anionic. The formal charge on benzene is correlated to assignment of the metal oxidation state which generally poses a problem. Herein, we take advantage of the structural similarities found when comparing Ca<jats:sup>II<\/jats:sup> with Yb<jats:sup>II<\/jats:sup>, and Sr<jats:sup>II<\/jats:sup> with Sm<jats:sup>II<\/jats:sup> complexes. In this work, we found an excellent overlap of the Ca\/Yb inverse sandwich structures but a striking difference for the Sr\/Sm pair. The much shorter Sm\u2212N and Sm\u2010C<jats:sub>6<\/jats:sub>H<jats:sub>6<\/jats:sub> distances are strong evidence for a Sm<jats:sup>III<\/jats:sup>\u2010benzene<jats:sup>\u22124<\/jats:sup>\u2010Sm<jats:sup>III<\/jats:sup> assignment. This was further supported by NMR spectroscopy, magnetic susceptibility, reactivity and comprehensive computational investigation.<\/jats:p>","DOI":"10.1002\/anie.202405229","type":"journal-article","created":{"date-parts":[[2024,4,13]],"date-time":"2024-04-13T09:36:16Z","timestamp":1713000976000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["Similarities and Differences in Benzene Reduction with Ca, Sr, Yb and Sm: Strong Evidence for Tetra\u2010Anionic Benzene"],"prefix":"10.1002","volume":"63","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9103-780X","authenticated-orcid":false,"given":"Sandeep Kumar","family":"Thakur","sequence":"first","affiliation":[{"name":"Inorganic and Organometallic Chemistry Universit\u00e4t Erlangen-N\u00fcrnberg  Egerlandstrasse 1 91058 Erlangen 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