bis(tetramethylcyclopentadienyl)dimethylgermanium | 134939-44-9

• 分子结构分类: 有机化合物 - 碳氢化合物 - 不饱和烃
• 英文名称: bis(tetramethylcyclopentadienyl)dimethylgermanium
• 英文别名: Dimethyl-bis(2,3,4,5-tetramethylcyclopenta-2,4-dien-1-yl)germane
• CAS: 134939-44-9
• 化学式: C₂₀H₃₂Ge
• 分子量: 345.064
• InChiKey: MFEMLZKYQXSJRI-UHFFFAOYSA-N

物化性质

• 沸点：
  370.5±52.0 °C(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  6.81
• 重原子数：
  21
• 可旋转键数：
  2
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.6
• 拓扑面积：
  0
• 氢给体数：
  0
• 氢受体数：
  0

反应信息

• 作为反应物：
  描述：

  正丁基锂 、 bis(tetramethylcyclopentadienyl)dimethylgermanium 以 乙醚 为溶剂， 以91%的产率得到
  参考文献：
  名称：

  Niobium, titanium, zirconium and hafnium complexes incorporating germanium bridged ansa ligands. X-Ray crystal structures of [Zr{Me2Ge(η5-C5Me4)2}Cl2] and [M{Me2Ge(η5-C5Me4)(η5-C5H4)}Cl2] (M=Zr, Hf)

  摘要：

  Both the symmetric and asymmetric ansa-ligand precursors Me2Ge(C5Me4H)(2) (1) and Me2Ge(C5Me4H)(C5H4R) (R = H (3), Me (4)) and their lithium derivatives Li-2{Me2Ge(C5Me4)(2)} (5) and Li-2{Me2Ge(C5Me4)(C5H3R)} (R = H (6), Me (7)) have been prepared. The ansa-niobocene imido complex [Nb(=NBu'){Me2Ge(eta(5)-C5Me4)(eta(5)-C5H4)}Cl] (8) was synthesized by the reaction of [Nb(=NBu')Cl-3(py)(2)] with the appropriate lithiated ansa-precursor. The Group 4 metal complexes containing germanium bridged ansa-ligands [M{Me2Ge(eta(5)-C5Me4)(2)}Cl-2] (M = Ti (9), Zr (10), Hf (11)), [M{Me2Ge(eta(5)-C5Me4)(eta(5)-C5H4)}Cl-2] (M = Ti (12), Zr (13), Hf (14)), and [M{Me2Ge(eta(5)-C5Me4)(eta(5)-C5H3Me)}Cl-2] (M = Ti (15), Zr (16), Hf (17)) were prepared by the reaction of MCl4 and the corresponding lithiated ansa-derivative. The molecular structures of 10, 13 and 14 were determined by single-crystal X-ray diffraction studies. Preliminary results for the catalytic activity of the Group 4 ansa-metallocene complexes in the polymerization of ethylene and propylene are reported. (C) 2002 Elsevier Science B.V. All rights reserved.

  DOI：

  10.1016/s0022-328x(02)01576-0
• 作为产物：
  描述：

  1,2,3,4-四甲基-1,3-环戊二烯 、 二氯二甲基锗 在 n-BuLi 作用下， 以 四氢呋喃 为溶剂， 以21%的产率得到bis(tetramethylcyclopentadienyl)dimethylgermanium
  参考文献：
  名称：

  镧系元素的有机金属化合物。64.二甲基锗双（四甲基环戊二烯基）卤化物和镧系元素的烷基衍生物的合成和x射线晶体结构

  摘要：

  Metathesis of Me2GeCl2 or Me2SnCl2 with 2 equiv of LiC5Me4H affords Me2Ge(C5Me4H)2 (1) and Me2Sn(C5Me4H)2 (2), respectively. The subsequent deprotonation of 1 with MeLi yields only the desired dilithium salt Me2Ge(C5Me4Li)2 (3) whereas 2 forms Me4Sn and two LiC5Me4H. The trichlorides of neodymium, samarium, holmium, and lutetium react with the dilithium salt 3 with the formation of Me2Ge(C5Me4)2LnCl2Li(THF)2 (Ln = Nd (4), Sm (5), Ho (6), Lu (7)). The reaction of 4 and 6 with LiCH(SiMe3)2 produces Me2Ge(C5Me4)2LnCH(SiMe3)2 (Ln = Nd (8), Ho (9)). The new compounds have been characterized by elemental analysis, mass and NMR spectra, as well as X-ray structural analysis of 5, 7, and 9. The halides 5 and 7 crystallize in the monoclinic space group P2(1)/c (No. 14) with a = 9.7284 (9), b = 19.397 (1), c = 16.610 (2) angstrom, beta = 98.963 (9)-degrees; Z = 4 or a = 9.578 (3), b = 19.218 (4), c = 16.525 (4) angstrom, beta = 99.73 (2)-degrees; Z = 4, respectively. Least-squares refinement led to a final R value of 0.020 (F(o) > 4-sigma-(F(o))) for 5554 independent reflections for 5 or of 0.028 (F(o) > 3-sigma-(F(o))) for 5822 independent reflections for 7. Compound 9 crystallizes in the monoclinic space group P2(1)/m (No. 11) with a = 9.2621 (8), b = 14.216 (2), c = 11.839 (2) angstrom, beta = 107.79 (1)-degrees, Z = 2, and R = 0.023 (F(o) > 4-sigma-(F(o))) for 2954 reflections. The structure of 9 shows a short Ho-C(methyl) contact of 2.774 (4) angstrom.

  DOI：

  10.1021/om00054a017

文献信息

• Synthesis, structures and polymerization catalytic properties of germyl-bridged bis(cyclopentadienyl) metallocenes
  作者：Shansheng Xu、Xuliang Dai、Baiquan Wang、Xiuzhong Zhou

  DOI：10.1016/s0022-328x(01)01396-1

  日期：2002.2

  The ansa-metallocene complexes Me2Ge(eta(5)-C5Me4)(2)MCl2 [M = Ti (1), Zr (2)], Me2Ge(eta(5)-C5H3Bu-t)(2)ZrCl2 (3) and Me2Ge(eta(5)-C5H4)(eta(5)-C5H3R)ZrCl2 [R = Me (4), t-Bu (5)] were prepared by the reaction of the corresponding ligands with n-BuLi and MCl4.2THF, respectively. The molecular structures of 1 and 2 have been determined by the X-ray diffraction method. Complexes 2-5 in combination with MAO were studied as catalysts for ethylene polymerization and all the germyl-bridged zirconocene catalysts show high activities at relative high temperatures. This indicates that the germyl-bridged zirconocene systems show thermally stable catalyst systems for polymerization of ethylene. (C) 2002 Elsevier Science B.V. All rights reserved.