Cationic R‐Substituted‐Indenyl Nickel(II) Complexes of Arsine and Stibine Ligands: Synthesis, Characterization, and Catalytic Behavior in the Oligomerization of Styrene
作者:Clara S. B. Gomes、Sandra I. Costa、Leonel C. Silva、Manuel Jiménez‐Tenorio、Pedro Valerga、M. Carmen Puerta、Pedro T. Gomes
DOI:10.1002/ejic.201701197
日期:2018.2.7
A series of new cationic Rn‐substituted‐indenyl nickel(II) complexes containing arsine or stibine ligands were synthesized in moderate to very high yields by the protonation of the corresponding bis(indenyl) nickel derivatives [Ni(η‐Rn‐Ind)2] with HBF4, in the presence of 2 equiv. of AsPh3 or SbPh3 donor ligands. These complexes, with the general formula [Ni(η‐Rn‐Ind)(EPh3)2]BF4 (E = As, Sb), were
一系列新的阳离子[R ñ -取代的茚基镍(II)含胂或配体复合物在中度至非常高的产率通过相应的双(茚基)镍衍生物[镍(η-R的质子化合成Ñ -Ind )2 ]与HBF 4在2当量的存在下。AsPh 3或SbPh 3供体配体。这些配合物,通式为[Ni(η-Rn - Ind)(EPh 3)2 ] BF 4(E = As,Sb),通过NMR光谱学和X射线衍射进行结构表征,随后被测试为苯乙烯低聚的单组分催化剂,导致形成了非常低分子量的头尾低聚物(通常由二聚体,三聚体和四聚体组成)。新的1或2单取代的茚基Ni II催化剂前体表现出极高的催化活性,大大高于对称的未取代的和1,3-二取代的茚基镍类似物(即单取代>>非取代> 1,3-二取代),它们的反应模式与相应的烯丙基衍生物相似。高产率制备[NiBr 2]的更简单,更直接的实验程序(DME)],一种重要的镍原料,也已用于制备这项工作的双(茚基)镍前体。