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The distance between the bridgehead Si atoms in <jats:bold>1<\/jats:bold> is much longer than those in typical Si=Si bonds, but still shorter than that of a previously reported pentasila[1.1.1]propellane. DFT calculations suggest that the bridgehead bond in <jats:bold>1<\/jats:bold> comprises a \u03c3\u2005bond with an inverted geometry and a \u03c0\u2005bond. This notion is supported by the UV\/Vis spectrum of <jats:bold>1<\/jats:bold>, which exhibits several absorption bands in the UV\/Vis region. While <jats:bold>1<\/jats:bold> is stable toward typical trapping agents for Si=Si double bonds, <jats:bold>1<\/jats:bold> reacts with carbon tetrachloride to furnish a hexachlorotetrasilane.<\/jats:p>","DOI":"10.1002\/anie.201900824","type":"journal-article","created":{"date-parts":[[2019,2,5]],"date-time":"2019-02-05T14:12:55Z","timestamp":1549375975000},"page":"4371-4375","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":29,"title":["A Tetrasilicon Analogue of Bicyclo[1.1.0]but\u20101(3)\u2010ene Containing a Si=Si Double Bond with an Inverted Geometry"],"prefix":"10.1002","volume":"58","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8556-5785","authenticated-orcid":false,"given":"Takeaki","family":"Iwamoto","sequence":"first","affiliation":[{"name":"Department of Chemistry Graduate School of Science Tohoku University  Aoba-ku Sendai 980-8578 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