Isolable <i>p</i>- and <i>m</i>-[(<sup><i>t</i></sup>Bu<sub>2</sub>MeSi)<sub>2</sub>Si]<sub>2</sub>C<sub>6</sub>H<sub>4</sub>: Disilaquinodimethane vs Triplet Bis(silyl radical)
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Isomeric p- and m-disilaquinodimethanes 2 and 4 were synthesized by the reductive dehalogenation of the corresponding p- and m-bis(halosilyl)benzenes 1 and 3, respectively, and were isolated and structurally characterized. The X-ray diffraction and solid-state NMR studies of 2 revealed its singlet quinodimethane structure featuring two exocyclic SiC double bonds with some singlet biradical contribution. In contrast, the X-ray crystallography and EPR measurements of 4 disclosed its biradical nature, described as a triplet ground state bis(silyl radical).
创建时间：
2011-04-20
