• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >Cationic Allyl Complexes of the Rare-Earth Metals: Synthesis,Structural Characterization, and 1,3-Butadiene Polymerization Catalysis
【24h】

Cationic Allyl Complexes of the Rare-Earth Metals: Synthesis,Structural Characterization, and 1,3-Butadiene Polymerization Catalysis

机译：稀土金属的阳离子烯丙基配合物：合成，结构表征和1，3-丁二烯聚合催化。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Monocationic bis-allyl complexes [LnACHTUNGTRENUNG(h3-C3H5) ACHTUNGTRENUNG(thf)3]+[BACHTUNGTRENUNG(C6X5)4](Ln=Y, La, Nd; X=H, F) and dicationic mono-allyl complexes of yttrium and the early lanthanides [LnACHTUNGTRENUNG(h3-C3H5)-ACHTUNGTRENUNG(thf)6]2+ACHTUNGTRENUNG[BPh4]2 (Ln=La, Nd) were prepared by protonolysis of the trisallyl complexes [LnACHTUNGTRENUNG(h3-C3H5)3ACHTUNGTRENUNG diox)] (Ln=Y, La, Ce, Pr, Nd, Sm; diox=1,4-dioxane) isolated as a 1,4-dioxanebridged dimer (Ln=Ce) or THF adducts [LnACHTUNGTRENUNG(h3-C3H5)3ACHTUNGTRENUNG(thf)2] (Ln= Ce,Pr). Allyl abstraction from the neutral tris-allyl complex by a Lewis acid, ER3(AlACHTUNGTRENUNG(CH2SiMe3)3, BPh3) gave the ion pair [LnACHTUNGTRENUNG(h3-C3H5)2ACHTUNGTRENUNG(thf)3]+ACHTUNGTRENUNG[ER3(h1-CH2CH=CH2)] (Ln=Y, La; ER3=Al-ACHTUNGTRENUNG(CH2SiMe3)3, BPh3). Benzophenone inserts into the LaCallyl bond of [LaACHTUNGTRENUNG(h3-C3H5)2ACHTUNGTRENUNG(thf)3]+ACHTUNGTRENUNG[BPh4] to form the alkoxy complex [LaACHTUNGTRENUNG{OCPh2(CH2CH=CH2)}2ACHTUNGTRENUNG(thf)3]+ACHTUNGTRENUNG[BPh4]. The monocationic half-sandwich complexes [Ln(h5-C5Me4SiMe3)(h3-C3H5)(thf)2]+[B(C6X5)4] (Ln=Y, La; X=H, F) were synthesized from the neutral precursors [Ln(h5-C5Me4SiMe3)ACHTUNGTRENUNG(h3-C3H5)2ACHTUNGTRENUNG(thf)] by protonolysis. For 1,3-butadiene polymerization catalysis, the yttrium-based systems were more active than the corresponding lanthanum or neodymium homologues, giving polybutadiene with approximately 90% 1,4-cis stereoselectivity.
机译：单阳离子双烯丙基复合物[LnACHTUNGTRENUNG（h3-C3H5）ACHTUNGTRENUNG（thf）3] + [BACHTUNGTRENUNG（C6X5）4]（Ln = Y，La，Nd; X = H，F）以及钇和Y的单一单烯丙基配合物早期镧系元素[LnACHTUNGTRENUNG（h3-C3H5）-ACHTUNGTRENUNG（thf）6] 2 + ACHTUNGTRENUNG [BPh4] 2（Ln = La，Nd）是通过三烯丙基化合物[LnACHTUNGTRENUNG（h3-C3H5）3oxTungTungTon）的质子分解制备的（Ln = Y，La，Ce，Pr，Nd，Sm; diox = 1,4-dioxane）分离为1,4-二恶烷桥接的二聚体（Ln = Ce）或THF加合物[LnACHTUNGTRENUNG（h3-C3H5）3ACHTUNGTRENUNG（thf ）2]（Ln = Ce，Pr）。路易斯酸ER3（AlACHTUNGTRENUNG（CH2SiMe3）3，BPh3）从中性三烯丙基络合物中烯丙基提取得到离子对[LnACHTUNGTRENUNG（h3-C3H5）2ACHTUNGTRENUNG（thf）3] + ACHTUNGTRENUNG [ER3（h1-CH2CH = CH2）]（Ln = Y，La; ER3 = Al-ACHTUNGTRENUNG（CH2SiMe3）3，BPh3）。二苯甲酮插入[LaACHTUNGTRENUNG（h3-C3H5）2ACHTUNGTRENUNG（thf）3] + ACHTUNGTRENUNG [BPh4]的LaCallyl键中，形成烷氧基络合物[LaACHTUNGTRENUNG {OCPh2（CH2CH = CH2）} 2ACHTUNGTRENUNG（thf）3] + ]。由中性前体合成单阳离子半三明治配合物[Ln（h5-C5Me4SiMe3）（h3-C3H5）（thf）2] + [B（C6X5）4]（Ln = Y，La; X = H，F） [Ln（h5-C5Me4SiMe3）ACHTUNGTRENUNG（h3-C3H5）2ACHTUNGTRENUNG（thf）]通过质子分解。对于1,3-丁二烯聚合催化，基于钇的体系比相应的镧或钕同系物更具活性，从而使聚丁二烯具有约90％的1,4-顺式立体选择性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号