Novel 1,2‐Dicarba‐<i>closo</i>‐dodecaborane(12) Derivatives of Selenium

Abstract

Abstract Lithiation of 1,2‐dicarba‐ closo ‐dodecaborane(12) ( 1 ) followed by insertion of selenium into both C–Li bonds leads to the 1,2‐diselenolato‐1,2‐dicarba‐ closo ‐dodecaborane(12) dianion ( 3 ), which is converted by oxidative coupling into the cyclic eight‐membered bis(diselane) 4 with annellated carborane moieties. Oxidative addition of 4 to ethenebis(triphenylphosphane)platinum(0) gives the bis(triphenylphosphane)platinum(II) complex 7 , which contains a chelating 1,2‐diselenolato‐1,2‐dicarba‐ closo ‐dodecaborane(12) ligand, by symmetric cleavage of the eight‐membered ring in 4 and displacement of ethene. The molecular structures of 4 and 7 were determined by X‐ray analysis. The solution‐state structures of the new compounds are supported by multinuclear NMR data ( 1 H, 11 B, 13 C, 29 Si, 31 P, 77 Se, 195 Pt). (© Wiley‐VCH Verlag GmbH &amp; Co. KGaA, 69451 Weinheim, Germany, 2007)