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This system is non\u2010aromatic as determined by Nucleus Independent Chemical Shift Calculations (NICS(0)=\u22120.28, NICS(1)=\u22123.17), with the primary contributing resonance structures shown by Natural Resonance Theory (NRT) to involve a Sn=Sn double bond and 1,2\u2010localized negative charges. Abstraction of the K\n                    <jats:sup>+<\/jats:sup>\n                    cations or oxidation leads to contraction or cleavage of the Sn\n                    <jats:sub>4<\/jats:sub>\n                    unit, respectively, while protonation generates the neutral dihydride 1,2\u2010Sn\n                    <jats:sub>4<\/jats:sub>\n                    {B(NDippCH)\n                    <jats:sub>2<\/jats:sub>\n                    }\n                    <jats:sub>4<\/jats:sub>\n                    H\n                    <jats:sub>2<\/jats:sub>\n                    (a heavier homologue of cyclobutene) in a manner consistent with the predicted charge distribution in the [Sn\n                    <jats:sub>4<\/jats:sub>\n                    {B(NDippCH)\n                    <jats:sub>2<\/jats:sub>\n                    }\n                    <jats:sub>4<\/jats:sub>\n                    ]\n                    <jats:sup>2\u2212<\/jats:sup>\n                    dianion.\n                  <\/jats:p>","DOI":"10.1002\/chem.202300006","type":"journal-article","created":{"date-parts":[[2023,1,3]],"date-time":"2023-01-03T06:59:00Z","timestamp":1672729140000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Synthesis of Homo\u2010Metallic Heavier Analogues of Cyclobutene and the Cyclobutadiene Dianion**"],"prefix":"10.1002","volume":"29","author":[{"given":"Xiongfei","family":"Zheng","sequence":"first","affiliation":[{"name":"Inorganic Chemistry Laboratory Department of Chemistry University of Oxford  South Parks Road OX1\u20093QR Oxford UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Agamemnon E.","family":"Crumpton","sequence":"additional","affiliation":[{"name":"Inorganic Chemistry Laboratory Department of Chemistry University of Oxford  South Parks Road OX1\u20093QR Oxford UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrey V.","family":"Protchenko","sequence":"additional","affiliation":[{"name":"Inorganic Chemistry Laboratory Department of Chemistry University of Oxford  South Parks Road OX1\u20093QR Oxford UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mathias A.","family":"Ellwanger","sequence":"additional","affiliation":[{"name":"Inorganic Chemistry Laboratory Department of Chemistry University of Oxford  South Parks Road OX1\u20093QR Oxford UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andreas","family":"Heilmann","sequence":"additional","affiliation":[{"name":"Inorganic Chemistry Laboratory Department of Chemistry University of Oxford  South Parks Road OX1\u20093QR Oxford UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9998-9434","authenticated-orcid":false,"given":"Simon","family":"Aldridge","sequence":"additional","affiliation":[{"name":"Inorganic Chemistry Laboratory Department of Chemistry University of Oxford  South Parks Road OX1\u20093QR Oxford UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2023,2,27]]},"reference":[{"key":"e_1_2_8_1_1","unstructured":"See for example:Chem. 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