Facile Synthesis of ansa-Zirconocenes Incorporating a Linked Dicarbollyl Ligand via Direct Deboration of Zirconocene Carboranyl Complexes
摘要:
ansa-Zirconocene amides incorporating a Me2C-linked cyclopentadienyl-dicarbollyl or indenyl-dicarbollyl ligand were conveniently prepared from direct deboration of the corresponding carboranyl metal complexes using diamines as deboration agents. This represents a new methodology for the preparation of metal dicarbollides.
Multiple Insertion of Unsaturated Molecules into the Zr−N Bonds of [<i>η</i><sup>5</sup>:<i>σ</i>-Me<sub>2</sub>A(C<sub>9</sub>H<sub>6</sub>)(C<sub>2</sub>B<sub>10</sub>H<sub>10</sub>)]Zr(NMe<sub>2</sub>)<sub>2</sub> (A = C, Si)
作者:Haiping Wang、Hung-Wing Li、Zuowei Xie
DOI:10.1021/om0304255
日期:2003.10.1
The compounds [eta(5):sigma-Me(2)A(C9H6)(C2B10H10)]Zr(NMe2)(2) (A = C, Si) reacted with CS2, PhCN, CH2=CHCN, (BuNCS)-Bu-n, and PhNCO to give the mono-, di-, and triinsertion products, depending upon the substrates. These unsaturated substances inserted exclusively into the Zr-N bonds, and the Zr-C(cage) bond remains intact in all reactions. It is believed that the preference of Zr-N over Zr-C(cage) insertion is governed by steric factors. The metal amide compounds also initiated the polymerization of CH2=CHCN to produce poly(acrylonitrile) and catalyzed the trimerization of PhNCO. On the other hand, they reacted with methyl methacrylate to afford [eta(5):sigma-Me(2)A(C9H6)(C2B10H10)}Zr(OCH3)(mu-OCH3)](2) and CH2=C(Me)CONMe2. All insertion products were fully characterized by various spectroscopic data, elemental analyses, and X-ray diffraction studies.
Synthesis, Structure, and Bonding of a Zirconocene-1,2-Dehydro-o-carborane Complex