226559-07-5Relevant academic research and scientific papers
Facile preparation of mono- and bis(tin)-substituted niobocenes with functionalized stannyl ligands: The search for non-classical interligand interactions
Nikonov, Georgii I.,Kuzmina, Lyudmila G.,Lorberth, J?rg,Howard, Judith A. K.
, p. 825 - 831 (2007/10/03)
The reaction of niobocene trihydride [Cp2NbH3] with one equivalent of an alkyl- or aryltin halide X(n)SnR(4-n) (n = 1, 2) leads to products of the displacement of hydride by tin, i.e. [Cp2NbH2(SnX(3-n)R(n)] [R= Me, n = 3 (1); R = Me, X = C1, n = 2(3);R=Ph, n=3 (4);R=Ph, X=Cl, n=2(5);R=Et, X= Br, n = 2 (6)]. Use of an excess of the tin reagent results in a halodealkylation exchange reaction at the tin atom bound to the metal center. Reaction of the mono(silyl) complexes [Cp2NbH2(SiXMe2)] (X = C1, Ph) with organotin halides X(n)SnR(4-n) gives products of the displacement of silicon by tin, whereas the bis(silyl) complex [Cp2NbH(SiPhMe2)2] does not undergo this reaction. The bis(tin)-substituted niobocene [Cp2NbH(SnMe3)2] has been prepared by the reaction of [Cp2NbH2(SnMe3)] with the tin amide Me3SnNMe2 under thermal conditions, as well as by the literature method of thermolysis of [Cp2NbH(η2-C2H3Ph)] in the presence of Me3SnH. Reaction of [Cp2NbH(SnMe3)2] with two equivalents of Cl2SnMe2 affords the bis(tin)-substituted complex [Cp2NbH(SnC1Me2)2] (9). The possible presence of non-classical hypervalent H···Sn-C1 interactions in this compound has been assessed by means of X-ray structure analysis. The structural data for 9 are in accord with an essentially classical description as a tin-substituted dihydride complex without significant Sn···H interactions.
