已经开发了几种新的合成途径,可以达到空间拥挤的(C 5 Me 5)3 U配合物。(C 5我5)3 U可以通过[(C(a)的反应而制备的5我5)2 UH 2 ] 2与tetramethylfulvene,(B)还原(C的5我5)2与(C铅5我5)2 UH(DMPE),(c)[(C 5 Me 5)2 U(L)] +(L = THF,DMPE)与K(18-crown-6)(C5 Me 5),和(d)[(C 5 Me 5)2 U] [BPh 4 ]与KC 5 Me 5的反应。(C 5 Me 5)2 UH(DMPE)与C 8 H 8的反应形成了(C 5 Me 5)3 U / C 8 H 8反应的产物,[(C 8 H 8)(C 5 Me 5 ] U] 2(C 8 H 8)。(C的X射线晶体结构报告了本研究中使用的5 Me 5)2 U [N(SiMe 3)2 ]和[(C 5 Me 5)2 U] [BPh
Lewis-Acid Stabilized Organoimide Complexes of Divalent Samarium, Europium, and Ytterbium
作者:Benjamin M. Wolf、Christoph Stuhl、Cäcilia Maichle-Mössmer、Reiner Anwander
DOI:10.1002/chem.201803619
日期:2018.10.22
Discrete organoimide complexes of the divalent rare‐earthmetals samarium, europium, and ytterbium are reported. Tandem salt metathesis‐protonolysis reactions using LnII bis(tetramethylaluminate) precursors [Ln(AlMe4)2]n and monopotassium salts of 2,6‐diisopropylaniline (H2NDipp) and triphenylsilylamine prove viable and efficient protocols. Depending on the ionic radius of the LnII metal centers and the
Cyclopentadienyl Ring Metathesis with Organocalcium and Organopotassium Compounds
作者:Pamela S. Tanner、Jason S. Overby、Maurice M. Henein、Timothy P. Hanu
DOI:10.1002/cber.19971300204
日期:1997.2
Cyclopentadienylringmetathesis occurs between [Ca(C5Me5)2] and [Ln(C5H5)3] complexes in toluene to generate the mixed ringcompounds [Ln(C5Me5)2(C2H5)] (Ln1-La, 1-Nd). 1-Nd has been characterized with X-ray diffraction as a sterically crowded monomer. Only one ring is exchanged between [Ca(C5Me5)2(thf)x] and [La(C5H5)3(thf)x] in toluene to yield [La(C5Me5)C5H5)2 (thf)] (2). In reaction with [M(C5H5)2]
环戊二烯基环易位发生在甲苯中的[Ca(C 5 Me 5)2 ]和[Ln(C 5 H 5)3 ]络合物之间,从而生成混合环化合物[Ln(C 5 Me 5)2(C 2 H 5) ](Ln 1 -La,1 -Nd)。1- Nd已经通过X射线衍射表征为空间上拥挤的单体。[Ca(C 5 Me 5)2(thf)x ]和[La(C 5 H 5)之间仅交换一个环在甲苯中的3(thf)x ]产生[La(C 5 Me 5)C 5 H 5)2(thf)](2)。与[M(C 5 H 5)2 ](MSn,Pb,Mn)反应,[Ca(C 5 M 5)2(thf)x ]产生相应的[M(C 5 Me 5)2 ]配合物。K [C 5 Me 5 ]与[La(C 5 H 5)3(thf)],[Sn(C 5 H 5)2 ]和[Pb [C 5 H 5)2 ]在甲苯中分别得到环交换产物2,[Sn(C 5 Me 5)2 ]和[Pb(C 5
Group 14 triple-decker cations
作者:Jamie N. Jones、Jennifer A. Moore、Alan H. Cowley、Charles L. B. Macdonald
DOI:10.1039/b510337a
日期:——
The triple-decker cations trans-[(Cp*Sn)2(μ-η5:η5-Cp*)]+ and trans-[(Cp*Pb)2(μ-η5:η5-Cp*)]+ have been prepared and structurally characterized as their [B(C6F5)4]− salts from the reactions of [Cp*M][B(C6F5)4]
(M = Sn, Pb) with the appropriate decamethylmetallocene. Both triple-decker cations adopt a cisoid arrangement of terminal Cp* groups, whereas the two known triple-decker main-group anions possess a transoid arrangement of terminal Cp groups. The reason for this conformational difference has been probed on the basis of DFT calculations.
New Synthetic Routes to Tris(pentaalkylcyclopentadienyl)lanthanide Complexes Including the X-ray Crystal Structure of (C<sub>5</sub>Me<sub>4</sub>Et)<sub>3</sub>Sm<sup>1</sup>
作者:William J. Evans、Kevin J. Forrestal、John T. Leman、Joseph W. Ziller
DOI:10.1021/om950779z
日期:1996.1.23
The synthetic chemistry leading to tris(pentamethylcyclopentadienyl)samarium complexes has been examined to determine why some routes fail and to develop routes superior to the first synthesis from (C5Me5)2Sm and 1,3,5,7-cyclooctatetraene (COT). (C5Me5)2Sm(THF) fails as a reagent since (C5Me5)3Sm reacts with any THF present to form the ring-opened product (C5Me5)2Sm[O(CH2)4C5Me5](THF). However, (C5Me5)2Sm(OEt2)
已经研究了导致三(五甲基环戊二烯基)sa络合物的合成化学方法,以确定为什么某些路线失败并开发出优于由(C 5 Me 5)2 Sm和1,3,5,7-环辛酸酯(COT )进行首次合成的路线)。(C 5 Me 5)2 Sm(THF)不能作为试剂,因为(C 5 Me 5)3 Sm与存在的任何THF反应形成开环产物(C 5 Me 5)2 Sm [O(CH 2)4 C 5 Me 5 ](THF)。但是,(C 5我5)2 Sm(OEt 2)与COT干净地反应形成(C 5 Me 5)3 Sm和(C 5 Me 5)Sm(C 8 H 8)。一种更有效的合成方法涉及(C 5 Me 5)2 Sm(OEt 2)与(C 5 Me 5)2 Pb的反应,生成> 90%收率的(C 5 Me 5)3 Sm。该路线已用于合成空间上更为拥挤的三(五烷基环戊二烯基)配合物(C 5Me 4 Et)3 Sm,这表明尚未实现此类中空间拥挤的限制。对(C
X-Ray crystal structures of bis(cyclopentadienyl)tin and bis(pentamethylcyclopentadienyl)lead
作者:Jerry L. Atwood、William E. Hunter、Alan H. Cowley、Richard A. Jones、Constantine A. Stewart
DOI:10.1039/c39810000925
日期:——
The X-raycrystalstructures of bis(cyclopentadienyl)tin (1) and the new compound bis(pentamethylcyclopentadienyl)lead (2) show that (i) both compounds are monomeric in the solid state and (ii) the C5H5 and Me5C5 rings in compounds (1) and (2), respectively, are bonded in the pentahapto-manner.
双(环戊二烯基)锡(1)和新化合物双(五甲基环戊二烯基)铅(2)的X射线晶体结构表明,(i)两种化合物均为固态单体,(ii)C 5 H 5和化合物(1)和(2)中的Me 5 C 5环分别以五半键结合。