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The alkyl complexes are demonstrated to be superbasic, rapidly deprotonating ethers below room temperature, leading to C\u2500O bond cleavage. In reactions with benzene, selective 1,4\u2010metalation of benzene is observed, forming an inverse\u2010crown areneide complex. This transformation, previously inaccessible to calcium, proceeds via a stepwise mechanism, which can also be facilitated by co\u2010complexation with organometallic reagents such as\n                    <jats:italic>tert<\/jats:italic>\n                    \u2010butyllithium and phenylpotassium.\n                  <\/jats:p>","DOI":"10.1002\/anie.202514283","type":"journal-article","created":{"date-parts":[[2025,10,8]],"date-time":"2025-10-08T06:28:04Z","timestamp":1759904884000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Superbasic Anionic Calcium Alkyl Complexes: Templated Twofold Deprotonation of Benzene"],"prefix":"10.1002","volume":"64","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1764-6636","authenticated-orcid":false,"given":"Li Feng","family":"Lim","sequence":"first","affiliation":[{"name":"Research School of Chemistry Australian National University  Acton ACT 2601 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0344-1085","authenticated-orcid":false,"given":"Ryan","family":"Huo","sequence":"additional","affiliation":[{"name":"Research School of Chemistry Australian National University  Acton ACT 2601 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-7574-9059","authenticated-orcid":false,"given":"Flynn C.","family":"Attard","sequence":"additional","affiliation":[{"name":"Research School of Chemistry Australian National University  Acton ACT 2601 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5025-7670","authenticated-orcid":false,"given":"Morteza","family":"Jamshidi","sequence":"additional","affiliation":[{"name":"Research School of Chemistry Australian National University  Acton ACT 2601 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2383-6380","authenticated-orcid":false,"given":"Alireza","family":"Ariafard","sequence":"additional","affiliation":[{"name":"Research School of Chemistry Australian National University  Acton ACT 2601 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7073-2766","authenticated-orcid":false,"given":"Fabian","family":"Kallmeier","sequence":"additional","affiliation":[{"name":"Research School of Chemistry Australian National University  Acton ACT 2601 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9450-2594","authenticated-orcid":false,"given":"Jamie","family":"Hicks","sequence":"additional","affiliation":[{"name":"Research School of Chemistry Australian National University  Acton ACT 2601 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,10,7]]},"reference":[{"key":"e_1_2_8_1_1","first-page":"1322","volume":"130","author":"Grignard V.","year":"1900","journal-title":"C. 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