PhP(fluorenyl-cyclopentadienyl)ZrCl2 | 205759-34-8

• 英文名称: PhP(fluorenyl-cyclopentadienyl)ZrCl2
• CAS: 205759-34-8
• 化学式: C₂₄H₁₇Cl₂PZr
• 分子量: 498.503
• InChiKey: DPUWVYBMVGRTCM-HZKZUFNGSA-L

反应信息

• 作为产物：
  描述：

  、 氯化锆(IV) 以 二氯甲烷 为溶剂， 生成 PhP(fluorenyl-cyclopentadienyl)ZrCl2
  参考文献：
  名称：

  Phosphorus-bridged metallocenes: New homogeneous catalysts for the polymerization of propene

  摘要：

  The synthesis of a new class of metallocenes for the syndiospecific, aspecific and isospecific polymerization of propene is reported. This has been achieved by the incorporation of a phosphorus linking the cyclopentadienyl-type rings. The catalyst precursors, syndiospecific PhP(fluorenyl-Cp)ZrCl2 (2), aspecific PhP(fluorenyl)(2)ZrCl2 (4), and isospecific PhP(indenyl)(2)ZrCl2 (5), RP(2-Me,4-Ph-indenyl)(2)ZrCl2 (R = Ph (6); R = Pr-i (7)) were prepared. Compound 2, after activation by methylaluminoxane (MAO), in LIPP at 67 degrees C affords syndiotactic polypropene (s-PP) with an activity of 155 kg s-PP/g Zr . h. The physical properties of the s-PP (stereoregularity and molecular weight) are similar to that of conventional carbon-bridged systems. Ab initio calculations on model compounds assisted in rationalizing the high syndiospecificity of 2 in contrast to the much poorer stereoreguIarity of closely related Me2Si(fluorenyl-Cp)ZrCl2. Aspecifrc merallocene 4, after activation with MAO, affords high molecular weight atactic-PP, albeit with a low activity. Metallocenes 6 and 7, activated by MAO, afford isotactic poiypropene (i-PP) with extremely high stereoregularity (> 98% mmmm pentads), melting points 156-160 degrees C and molecular weights tunable in the range 250,000-1,100,000. Activities of up to 580 kg i-PP/g Zr . h for 6/MAO (LIPP, 67 degrees C, 37 000 equiv. MAO) and 1265 kg i-PP/g Zr . h for 7/MAO (LIPP, 50 degrees C, 37 000 equiv. MAO) have been obtained. (C) 1998 EIsevier Science B.V.

  DOI：

  10.1016/s1381-1169(97)00178-7