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Compound <jats:bold>5\u2010Ph<\/jats:bold> containing a 16\u03c0\u2010electron planar fused\u2010tricyclic ring system was obtained by the 4e reduction of [(ADC<jats:sup>Ph<\/jats:sup>)PCl<jats:sub>2<\/jats:sub>]<jats:sub>2<\/jats:sub> (<jats:bold>4\u2010Ph<\/jats:bold>) with Mg (or KC<jats:sub>8<\/jats:sub>) in a quantitative yield. Experimental and computational results imply that the central 8\u03c0\u2010electrons C<jats:sub>4<\/jats:sub>P<jats:sub>2<\/jats:sub> ring of <jats:bold>5\u2010Ph<\/jats:bold>, which is fused between two 6\u03c0\u2010electrons C<jats:sub>3<\/jats:sub>N<jats:sub>2<\/jats:sub> aromatic rings, is antiaromatic. Thus, each of the phosphorus atoms of <jats:bold>5\u2010Ph<\/jats:bold> has two electron\u2010lone\u2010pairs, one in a p\u2010type orbital is in conjugation with the C=C bonds of the C<jats:sub>4<\/jats:sub>P<jats:sub>2<\/jats:sub> ring, while the second resides in a \u03c3\u2010symmetric orbital. This can be shown with the gold complex [(ADC<jats:sup>Ph<\/jats:sup>)P(AuCl)<jats:sub>2<\/jats:sub>]<jats:sub>2<\/jats:sub> (<jats:bold>6\u2010Ph<\/jats:bold>) obtained by reacting <jats:bold>5\u2010Ph<\/jats:bold> with (Me<jats:sub>2<\/jats:sub>S)AuCl. A mixture of <jats:bold>5\u2010Ph<\/jats:bold> and <jats:bold>4\u2010Ph<\/jats:bold> undergoes comproportionation in the presence of MgCl<jats:sub>2<\/jats:sub> to form the intermediate oxidation state compound [(ADC<jats:sup>Ar<\/jats:sup>)P]<jats:sub>2<\/jats:sub>(MgCl<jats:sub>4<\/jats:sub>) (<jats:bold>7\u2010Ph<\/jats:bold>), which is an aromatic species.<\/jats:p>","DOI":"10.1002\/chem.202003617","type":"journal-article","created":{"date-parts":[[2020,10,20]],"date-time":"2020-10-20T13:11:30Z","timestamp":1603199490000},"page":"3055-3064","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":33,"title":["Isolation of a 16\u03c0\u2010Electrons 1,4\u2010Diphosphinine\u20101,4\u2010diide with a Planar C<sub>4<\/sub>P<sub>2<\/sub> Ring"],"prefix":"10.1002","volume":"27","author":[{"given":"Dennis","family":"Rottsch\u00e4fer","sequence":"first","affiliation":[{"name":"Molecular Inorganic Chemistry and Catalysis Inorganic and Structural Chemistry Center for Molecular Materials Faculty of Chemistry Universit\u00e4t Bielefeld  Universit\u00e4tsstrasse 25 33615 Bielefeld Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Beate","family":"Neumann","sequence":"additional","affiliation":[{"name":"Molecular Inorganic Chemistry and Catalysis Inorganic and Structural Chemistry Center for Molecular Materials Faculty of Chemistry Universit\u00e4t Bielefeld  Universit\u00e4tsstrasse 25 33615 Bielefeld Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hans\u2010Georg","family":"Stammler","sequence":"additional","affiliation":[{"name":"Molecular Inorganic Chemistry and Catalysis Inorganic and Structural Chemistry Center for Molecular Materials Faculty of Chemistry Universit\u00e4t Bielefeld  Universit\u00e4tsstrasse 25 33615 Bielefeld Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tetiana","family":"Sergeieva","sequence":"additional","affiliation":[{"name":"Inorganic and Computational Chemistry Group Allgemeine und Anorganische Chemie Universit\u00e4t des Saarlandes  Campus C4.1 66123 Saarbr\u00fccken Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Diego M.","family":"Andrada","sequence":"additional","affiliation":[{"name":"Inorganic and Computational Chemistry Group Allgemeine und Anorganische Chemie Universit\u00e4t des Saarlandes  Campus C4.1 66123 Saarbr\u00fccken Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2146-5432","authenticated-orcid":false,"given":"Rajendra S.","family":"Ghadwal","sequence":"additional","affiliation":[{"name":"Molecular Inorganic Chemistry and Catalysis Inorganic and Structural Chemistry Center for Molecular Materials Faculty of Chemistry Universit\u00e4t Bielefeld  Universit\u00e4tsstrasse 25 33615 Bielefeld Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2021,1,14]]},"reference":[{"key":"e_1_2_2_1_1","first-page":"98","volume":"3","author":"Kekul\u00e9 A.","year":"1865","journal-title":"Bull. 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