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The compound is dimeric, <jats:italic>C<\/jats:italic><jats:sub>2<\/jats:sub>\u2010symmetric and contains six lithium and four phosphorus atoms. Two lithium atoms cap the six\u2010membered C<jats:sub>2<\/jats:sub>B<jats:sub>4<\/jats:sub> faces, resulting in two 13\u2010vertex <jats:italic>closo<\/jats:italic>\u2010clusters (according to Wade's rules) with docosahedral geometry. The addition of methyl iodide resulted in the formation of zwitterionic bis\u2010phosphonium\u2010<jats:italic>nido<\/jats:italic>\u2010carborates 7,10\u2010bis(<jats:italic>tert<\/jats:italic>\u2010butyldimethylphosphonium)dodecahydro\u20107,10\u2010dicarba\u2010<jats:italic>nido<\/jats:italic>\u2010dodecaborate(2\u2212) (<jats:bold>1\u2009a<\/jats:bold>) and 7,10\u2010bis(<jats:italic>N<\/jats:italic>,<jats:italic>N<\/jats:italic>\u2010diisopropylaminodimethylphosphonium)dodecahydro\u20107,10\u2010dicarba\u2010<jats:italic>nido<\/jats:italic>\u2010dodecaborate(2\u2212) (<jats:bold>1\u2009b<\/jats:bold>) in moderate to good yields. Compounds <jats:bold>1\u2009a<\/jats:bold> and <jats:bold>1\u2009b<\/jats:bold> exhibit short C<jats:sub>cluster<\/jats:sub>\u2212P bonds and large C<jats:sub>cluster<\/jats:sub>\u22c5\u22c5\u22c5C<jats:sub>cluster<\/jats:sub> distances in the solid state. Further insight into the ring opening and reduction potential of the alkyl halide was obtained from methylation reactions of different 1,2\u2010bis\u2010phosphinocarboranes. The reaction of <jats:italic>rac<\/jats:italic>\u2010\/<jats:italic>meso<\/jats:italic>\u20101,2\u2010bis(<jats:italic>tert<\/jats:italic>\u2010butylmethylphosphino)\u20101,2\u2010dicarba\u2010<jats:italic>closo<\/jats:italic>\u2010dodecaborane(12) (<jats:bold>3\u2009a<\/jats:bold>) with two equivalents of methyl iodide also resulted in the formation of <jats:bold>1\u2009a<\/jats:bold> (as shown by NMR spectroscopy), whereas the reaction of 1,2\u2010bis(diphenylphosphino)\u20101,2\u2010dicarba\u2010<jats:italic>closo<\/jats:italic>\u2010dodecaborane(12) with methyl triflate afforded the phosphonium salt 1\u2010methyl\u2010diphenylphosphonium\u20102\u2010diphenylphosphino\u20101,2\u2010dicarba\u2010<jats:italic>closo<\/jats:italic>\u2010dodecaborane(12) triflate (<jats:bold>4<\/jats:bold>) without reduction of the cluster.<\/jats:p>","DOI":"10.1002\/chem.201800172","type":"journal-article","created":{"date-parts":[[2018,2,13]],"date-time":"2018-02-13T22:08:55Z","timestamp":1518559735000},"page":"6208-6216","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["12\u2010Vertex Zwitterionic Bis\u2010phosphonium\u2010<i>nido<\/i>\u2010carborates through Ring\u2010Opening Reactions of 1,2\u2010Diphosphetanes"],"prefix":"10.1002","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0490-8107","authenticated-orcid":false,"given":"Jan","family":"Schulz","sequence":"first","affiliation":[{"name":"Faculty of Chemistry and Mineralogy Institute of Inorganic Chemistry Leipzig University  Johannisallee 29 04103 Leipzig Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anika","family":"Kreienbrink","sequence":"additional","affiliation":[{"name":"Faculty of Chemistry and Mineralogy Institute of Inorganic Chemistry Leipzig University  Johannisallee 29 04103 Leipzig Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1387-4148","authenticated-orcid":false,"given":"Peter","family":"Coburger","sequence":"additional","affiliation":[{"name":"Faculty of Chemistry and Mineralogy Institute of Inorganic Chemistry Leipzig University  Johannisallee 29 04103 Leipzig Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5815-8703","authenticated-orcid":false,"given":"Benedikt","family":"Schwarze","sequence":"additional","affiliation":[{"name":"Faculty of Chemistry and Mineralogy Institute of Inorganic Chemistry Leipzig University  Johannisallee 29 04103 Leipzig Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9162-6487","authenticated-orcid":false,"given":"Toni","family":"Grell","sequence":"additional","affiliation":[{"name":"Faculty of Chemistry and Mineralogy Institute of Inorganic Chemistry Leipzig University  Johannisallee 29 04103 Leipzig Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1335-0897","authenticated-orcid":false,"given":"Peter","family":"L\u00f6nnecke","sequence":"additional","affiliation":[{"name":"Faculty of Chemistry and Mineralogy Institute of Inorganic Chemistry Leipzig University  Johannisallee 29 04103 Leipzig Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4267-0603","authenticated-orcid":false,"given":"Evamarie","family":"Hey\u2010Hawkins","sequence":"additional","affiliation":[{"name":"Faculty of Chemistry and Mineralogy Institute of Inorganic Chemistry Leipzig University  Johannisallee 29 04103 Leipzig Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2018,3,26]]},"reference":[{"key":"e_1_2_7_1_1","unstructured":"\u00a0"},{"key":"e_1_2_7_2_2","volume-title":"Carboranes","author":"Grimes R. 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