(2,5-t-Bu2-C4H2P)2ZrCl2 | 205743-08-4

• 英文名称: (2,5-t-Bu2-C4H2P)2ZrCl2
• CAS: 205743-08-4
• 化学式: C₂₄H₄₀Cl₂P₂Zr
• 分子量: 552.659
• InChiKey: UYJGYPDPZNXVCL-UHFFFAOYSA-L

反应信息

• 作为产物：
  描述：

  (2,5-t-Bu2-C4H2P)Li(THF)2 、 氯化锆(IV) 以 乙醚 为溶剂， 以15%的产率得到(2,5-t-Bu2-C4H2P)2ZrCl2
  参考文献：
  名称：

  Phospholyl catalysts for olefin polymerization

  摘要：

  Seventeen different phospholyl ligands were incorporated in a total of 22 zirconium complexes, (Phos)(2)ZrCl2, (Phos)(C5H5)ZrCl2, investigated in propylene polymerization catalysis using methylaluminoxane as cocatalyst. Atactic polypropylene with M-n varying from 450 to > 20 000 and vinylidene end groups (CH2=C(Me)R) was obtained with activities up to 170 kg/g Zr . h. For the 11 diphospholyls of structure (2,5-R2C4H2P)(2)ZrCl2, catalytic activity was highest with substituents of moderate bulk adjacent to phosphorus (e.g., c-Pr, Ph), whereas complexes with two small (H) or two large (CMe3, SiMe3) ligand substituents were inactive. It is hypothesized that optimum activity with MAO requires selective blocking of phosphorus lone pair coordination to aluminum, whilst allowing free propylene approach to the active site. The degree of polymerization increased steadily in the series of 2,5-disubstituted phospholyl complexes, dialkyl < alkyl-phenyl < diphenyl, suggesting that electronic factors are more important than steric factors in determining M-n. (C) 1998 Elsevier Science B.V.

  DOI：

  10.1016/s1381-1169(97)00170-2