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In the first step, K<jats:sub>2<\/jats:sub><jats:bold>1<\/jats:bold> reacts with KCN in water at elevated temperatures to yield [7\u2010NC\u2010<jats:italic>nido<\/jats:italic>\u2010B<jats:sub>11<\/jats:sub>H<jats:sub>12<\/jats:sub>]<jats:sup>2\u2212<\/jats:sup> (<jats:bold>5\u2009a<\/jats:bold>). Oxidation of <jats:bold>5\u2009a<\/jats:bold> with PbO<jats:sub>2<\/jats:sub> gives [NC\u2010<jats:italic>closo<\/jats:italic>\u2010B<jats:sub>11<\/jats:sub>H<jats:sub>10<\/jats:sub>]<jats:sup>2\u2212<\/jats:sup> (<jats:bold>2<\/jats:bold>). In analogous subsequent reactions, dianion <jats:bold>2<\/jats:bold> was converted with KCN regioselectively to [7,9\u2010(NC)<jats:sub>2<\/jats:sub>\u2010<jats:italic>nido<\/jats:italic>\u2010B<jats:sub>11<\/jats:sub>H<jats:sub>11<\/jats:sub>]<jats:sup>2\u2212<\/jats:sup> (<jats:bold>6\u2009a<\/jats:bold>), which was further oxidized to [(NC)<jats:sub>2<\/jats:sub>\u2010<jats:italic>closo<\/jats:italic>\u2010B<jats:sub>11<\/jats:sub>H<jats:sub>9<\/jats:sub>]<jats:sup>2\u2212<\/jats:sup> (<jats:bold>3<\/jats:bold>). The {<jats:italic>nido<\/jats:italic>\u2010B<jats:sub>11<\/jats:sub>} dianions <jats:bold>5\u2009a<\/jats:bold> and <jats:bold>6\u2009a<\/jats:bold> were protonated to yield [7\u2010NC\u2010<jats:italic>nido<\/jats:italic>\u2010B<jats:sub>11<\/jats:sub>H<jats:sub>13<\/jats:sub>]<jats:sup>\u2212<\/jats:sup> (<jats:bold>5\u2009b<\/jats:bold>) and [7,9\u2010(NC)<jats:sub>2<\/jats:sub>\u2010<jats:italic>nido<\/jats:italic>\u2010B<jats:sub>11<\/jats:sub>H<jats:sub>12<\/jats:sub>]<jats:sup>\u2212<\/jats:sup> (<jats:bold>6\u2009b<\/jats:bold>). All anions were studied by NMR spectroscopy and, except for <jats:bold>6\u2009b<\/jats:bold>, salts of all anions were characterized by IR and Raman spectroscopy and by elemental analysis. The position of the cyano group(s) in <jats:bold>5\u2009a<\/jats:bold> and <jats:bold>6\u2009a<\/jats:bold> were confirmed by NMR data and single\u2010crystal X\u2010ray diffraction studies on [Ph<jats:sub>4<\/jats:sub>P]<jats:sub>2<\/jats:sub><jats:bold>5\u2009a\u22c5<\/jats:bold>CH<jats:sub>2<\/jats:sub>Cl<jats:sub>2<\/jats:sub> and [Et<jats:sub>4<\/jats:sub>N]<jats:sub>2<\/jats:sub><jats:bold>6\u2009a<\/jats:bold>. The {<jats:italic>closo<\/jats:italic>\u2010B<jats:sub>11<\/jats:sub>} clusters are fluxional in solution. In the crystal of [EMIm]<jats:sub>2<\/jats:sub><jats:bold>2<\/jats:bold> the BCN vertex is in the 2\u2010position. Two isomers of dianion <jats:bold>3<\/jats:bold>, [2,3\u2010(NC)<jats:sub>2<\/jats:sub>\u2010<jats:italic>closo<\/jats:italic>\u2010B<jats:sub>11<\/jats:sub>H<jats:sub>9<\/jats:sub>]<jats:sup>2\u2212<\/jats:sup> and [2,6\u2010(NC)<jats:sub>2<\/jats:sub>\u2010<jats:italic>closo<\/jats:italic>\u2010B<jats:sub>11<\/jats:sub>H<jats:sub>9<\/jats:sub>]<jats:sup>2\u2212<\/jats:sup>, were identified in the crystal of its [Et<jats:sub>4<\/jats:sub>N]<jats:sup>+<\/jats:sup> salt. The peak oxidation potentials <jats:italic>E<\/jats:italic><jats:sub>pa<\/jats:sub> of anions <jats:bold>1<\/jats:bold>\u2013<jats:bold>3<\/jats:bold>, <jats:bold>5\u2009a<\/jats:bold>, <jats:bold>6\u2009a<\/jats:bold>, <jats:bold>5\u2009b<\/jats:bold>, and [<jats:italic>nido<\/jats:italic>\u2010B<jats:sub>11<\/jats:sub>H<jats:sub>14<\/jats:sub>]<jats:sup>\u2212<\/jats:sup> (<jats:bold>4\u2009b<\/jats:bold>), determined by cyclic voltammetry, increase with increasing number of cyano groups. Increasing <jats:italic>E<\/jats:italic><jats:sub>pa<\/jats:sub> in the order <jats:bold>1<\/jats:bold>&lt;<jats:bold>2<\/jats:bold>&lt;<jats:bold>3<\/jats:bold> parallels the increasing reactivity toward cyanide anions.<\/jats:p>","DOI":"10.1002\/chem.201704860","type":"journal-article","created":{"date-parts":[[2017,12,18]],"date-time":"2017-12-18T09:22:52Z","timestamp":1513588972000},"page":"3528-3538","source":"Crossref","is-referenced-by-count":12,"title":["Stepwise Introduction of Cyano Groups into <i>nido<\/i>\u2010 and <i>closo<\/i>\u2010Undecaborate Clusters"],"prefix":"10.1002","volume":"24","author":[{"given":"Szymon Z.","family":"Konieczka","sequence":"first","affiliation":[{"name":"Julius-Maximilians-Universit\u00e4t W\u00fcrzburg, Institut f\u00fcr Anorganische Chemie Institut f\u00fcr nachhaltige Chemie &amp; Katalyse mit Bor (ICB)  Am Hubland 97074 W\u00fcrzburg 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