Facile Preparation of Mono- and Bis(tin)-Substituted Niobocenes with Functionalized Stannyl Ligands: The Search for Non-Classical Interligand Interactions
✍ Scribed by Georgii I. Nikonov; Lyudmila G. Kuzmina; Jörg Lorberth; Judith A. K. Howard
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 269 KB
- Volume
- 1999
- Category
- Article
- ISSN
- 1434-1948
No coin nor oath required. For personal study only.
✦ Synopsis
The reaction of niobocene trihydride [Cp 2 NbH 3 ] with one [Cp 2 NbH(SnMe 3 ) 2 ] has been prepared by the reaction of [Cp 2 NbH 2 (SnMe 3 )] with the tin amide Me 3 SnNMe 2 under 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.
thermal conditions, as well as by the literature method of
of [Cp 2 NbH(SnMe 3 ) 2 ] with two equivalents of Cl 2 SnMe 2 affords the bis(tin)-substituted Br, n = 2 (6)]. Use of an excess of the tin reagent results in a halodealkylation exchange reaction at the tin atom bound to complex [Cp 2 NbH(SnClMe 2 ) 2 ] (9). The possible presence of non-classical hypervalent H•••Sn-Cl interactions in this the metal center. Reaction of the mono(silyl) complexes [Cp 2 NbH 2 (SiXMe 2 )] (X = Cl, Ph) with organotin halides compound has been assessed by means of X-ray structure analysis. The structural data for 9 are in accord with an X n SnR 4-n gives products of the displacement of silicon by tin, whereas the bis(silyl) complex [Cp 2 NbH(SiPhMe 2 ) 2 ] does not essentially classical description as a tin-substituted dihydride complex without significant Sn•••H interactions. undergo this reaction. The bis(tin)-substituted niobocene the present systems. The main-group element displacement