Synthesis and reactions of η-cycloheptatriene and η-cycloheptatrienyl derivatives of zirconium and hafnium
摘要:
The new compounds [M(eta-C7H8)L2Cl2] (M = Zr, L = PMe3 1; M = Hf, L = PMe3 2; M = Zr, L = PMe2Ph 3; M = Hf, L = PMe2Ph 4; M = Zr, L = PMePh2 5) have been synthesised by reduction of MCl4 using sodium amalgam in the presence of the tertiary phosphine and cycloheptatriene. Lithium indenide reacts with the triene compounds to give [M(eta-C7H7)(eta(5)-C9H7)] (M = Zr 6 or Hf 8) which react with trimethylphosphine or 1,2-bis(dimethylphosphino)ethane (dmpe) to form [M(eta-C7H7)(eta(5)-C9H7)(PMe3)] (M = Zr 7 or Hf 9) and [{Hf(eta-C7H7)(eta(-5)-C9H7)}2(mu-dmpe)] 10 respectively. Treatment of 1 or 2 with sodium cyclopentadienide gives [M(eta-C5H5)2{eta(2)-1,2- (or -3,4-) C7H8}(PMe)] [M = Zr 11 or Hf 12). The X-ray crystal structures of 1, 10 and [Zr(eta-C5H5)2(eta(2)-3,4-C7H8)(PMe3)] 11a have been determined.
Divalent diene and triene compounds of zirconium and hafnium; X-ray crystal structures of [Hf(η<sup>4</sup>-CH<sub>2</sub>CMe–CMeCH<sub>2</sub>)(PMe<sub>3</sub>)<sub>2</sub>Cl<sub>2</sub>], [Zr(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)<sub>2</sub>(PMe<sub>3</sub>)(η<sup>2</sup>-C<sub>7</sub>H<sub>8</sub>)], and {[Hf(η<sup>7</sup>-C<sub>7</sub>H<sub>7</sub>)(η<sup>5</sup>-C<sub>9</sub>H<sub>7</sub>)]<sub>2</sub>(µ-Me<sub>2</sub>PCH<sub>2</sub>CH<sub>2</sub>PMe<sub>2</sub>)}
作者:Malcolm L. H. Green、Neil M. Walker
DOI:10.1039/c39890001865
日期:——
The synthesis and reactions of divalent compounds [Hf(η4-CH2CMeâCMeCH2)(PMe3)2Cl2] and [M(η6-C7H8)(PMe3)2Cl2](M = Zr, Hf) are described.