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In the solid state, it undergoes dimerization to afford a 1,2,4,5\u2010tetragermacyclohexa\u20101,4\u2010diene derivative (Ge\n                    <jats:sub>4<\/jats:sub>\n                    CHD). Moreover, theoretical calculations on Ge\n                    <jats:sub>4<\/jats:sub>\n                    CHD reveal \u03c3*\u2013\u03c0 interactions between the two \u03c0 orbitals (Ge\u2550Ge) and the CH \u03c3* orbital. This interaction is confirmed by a significant red shift in the solid\u2010state UV\u2013vis spectrum. In contrast to the behavior in the solid state, the Ge\n                    <jats:sub>4<\/jats:sub>\n                    CHD derivative dissociates in solution into a methylene\u2010bridged 1,3\u2010bis(germylene) derivative. The resultant 1,3\u2010bis(germylene) derivative reacted with S\n                    <jats:sub>8<\/jats:sub>\n                    to form a novel cage compound containing three S and two Ge atoms. On the other hand, in the reaction with triphenylphosphine sulfide, the in situ generated 2\u2010thia\u20101,3\u2010digermabicyclo[1.1.0]butane derivative activated the benzene solvent, leading to the formation of a [2\u00a0+\u00a02] cycloaddition product. Additionally, the 1,3\u2010bis(germylene) derivative reacted with 4\u2010dimethylaminopyridine (DMAP) to form a three\u2010membered ring. Its structural parameters and the results of theoretical calculations indicated the zwitterionic character.\n                  <\/jats:p>","DOI":"10.1002\/anie.202508927","type":"journal-article","created":{"date-parts":[[2025,6,23]],"date-time":"2025-06-23T03:43:54Z","timestamp":1750650234000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Reactivity of a Methylene\u2010Bridged 1,3\u2010Bis(germylene) in Dynamic Equilibrium with Its Dimer"],"prefix":"10.1002","volume":"64","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-7870-7585","authenticated-orcid":false,"given":"Daichi","family":"Uchida","sequence":"first","affiliation":[{"name":"Institute for Chemical Research Kyoto University  Gokasho Uji Kyoto 611\u20100011 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