Unusual Equilibria Involving Group 4 Amides, Silyl Complexes, and Silyl Anions via Ligand Exchange Reactions
作者:Xianghua Yu、Hu Cai、Ilia A. Guzei、Ziling Xue
DOI:10.1021/ja031899y
日期:2004.4.1
1a + 1b (eq 1). The silyl anion 2 selectively attacks the -N(SiMe3)2 ligand in Zr(NMe2)3[N(SiMe3)2] (6) to give 1a and N(SiMe3)2- (7). Reversible reaction occurs as well, where 7 selectively substitutes the silyl ligand in Zr(NMe2)3(SiButPh2)2- (1a) or Zr(NMe2)3(SiButPh2), giving the equilibrium 6 + 2 2 right harpoon over left harpoon 1a + 7 (eq 3). The thermodynamics of these equilibria has been studied:
Disilyl Complexes of Zirconium, Hafnium, and Tantalum. Their Synthesis, Characterization, and Exchanges with Silyl Anions
作者:He Qiu、Hu Cai、Jaime B. Woods、Zhongzhi Wu、Tianniu Chen、Xianghua Yu、Zi-Ling Xue
DOI:10.1021/om050302f
日期:2005.8.1
Cyclopentadienyl-free disilyl amide complexes [(Me2N)3M(SiButPh2)2]- (M = Zr, 1; Hf, 2 as [Li(THF)4]+ salts), K(18-crown-6)3/2(Me2N)3M[(Me3Si)2Si-(CH2)2-Si(SiMe3)2]} (M = Zr, 3; Hf, 4), (Me2N)3Ta[Si(SiMe3)3]2 (5), (Me2N)3Ta(SiButPh2)2 (6), and (Me2N)3Ta(SiButPh2)[Si(SiMe3)3] (7) have been prepared. The structures of 1−4 have been determined by X-ray single-crystal diffraction. The two −Si(SiMe3)3-
不含环戊二烯基的二甲硅烷基酰胺络合物[(Me 2 N)3 M(SiBu t Ph 2)2 ] -(M = Zr,1 ; Hf,2 as [Li(THF)4 ] +盐),K(18-冠-6)3/2 (Me 2 N)3 M [(Me 3 Si)2 Si-(CH 2)2 -Si(SiMe 3)2 ]}(M = Zr,3 ; Hf,4),( Me 2 N)3 Ta [Si(SiMe 3)3] 2(5),(Me 2 N)3 Ta(SiBu t Ph 2)2(6)和(Me 2 N)3 Ta(SiBu t Ph 2)[Si(SiMe 3)3 ](7)具有准备好了。的结构1 - 4已通过X射线单晶衍射确定。两个-Si(森达3)3 -中(ME配体2 N)3的Ta [硅(森达3)3 ]2(5)是由依次-SiBu替换吨博士2 -阴离子,得到(ME 2 N)3 TA(西布吨博士2)[SI(森达3)3 ](7)和(ME
Group 4 metal compounds incorporating the amide ligand, [N(SiMe<sub>2</sub>{C<sub>6</sub>H<sub>4</sub>-2-OMe})<sub>2</sub>]<sup>−</sup>
作者:Lloyd T. J. Evans、Joy H. Farnaby、Martyn P. Coles、F. Geoffrey N. Cloke、Peter B. Hitchcock
DOI:10.1039/c5dt00684h
日期:——
[N(SiMe2C6H4-2-OMe})2]− (L), has been used as a pincer-type ligand in coordination chemistry. X-ray diffraction data for the lithium salt shows a trimetallic structure consisting of two equivalents of Li(L) that sequester a molecule of LiCl. The potassium salt K(L) is dimeric in the solid-state with bridging amide ligands. Each structure shows chelation of both O-donor groups to the electropositive metal. In contrast
苯甲醚取代的甲硅烷基酰胺阴离子[N(SiMe 2 C 6 H 4 -2-OMe})2 ] -(L)在配位化学中已用作钳型配体。锂盐的X射线衍射数据显示了由两个当量的Li(L)螯合LiCl分子组成的三金属结构。钾盐K(L)是固态的,具有桥联的酰胺配体。每个结构都显示两个O供体基团与正电金属的螯合。相反,钛化合物Ti(L)Cl 3与单齿酰胺为四配位。锆化合物Zr(L)2 Cl 2是具有六配位金属和两个N,O-双齿酰胺的单金属。
Deactivation pathways of ethylene polymerization catalysts derived from titanium and zirconium 1,3-bis(furyl)-1,1,3,3-tetramethyldisilazide complexes
作者:Lloyd T. J. Evans、Martyn P. Coles、F. Geoffrey、N. Cloke、Peter B. Hitchcock
DOI:10.1039/b704625a
日期:——
LiN(SiMe2R)2 [Lii}, R = furyl, Liii}, R = 2-methylfuryl] and titanium(IV)chloride at low temperature afforded the mono-amide compounds Tii}Cl3 (1a) and Tiii}Cl3 (1b). The analogous zirconium derivatives Zri}Cl3 (3a) and Zrii}Cl3 (3b) were accessed via the reaction of excess trimethylsilylchloride with the mixed tetra-amide species, Zri}(NMe2)3 (2a) and Zrii}(NMe2)3 (2b). The bis-amide complexes Tiii}2Cl2
前述锂酰胺盐LiN(SiMe 2 R)2 [Li i },R =呋喃基,Li ii },R = 2-甲基呋喃基]和钛(IV),氯化在低温下得到单酰胺化合物Ti i } Cl 3(1a)和Ti ii } Cl 3(1b)。通过过量的反应可以得到类似的锆衍生物Zr i } Cl 3(3a)和Zr ii } Cl 3(3b)。三甲基氯硅烷具有混合的四酰胺类物质Zr i }(NMe 2)3(2a)和Zr ii }(NMe 2)3(2b)。双酰胺络合物Ti ii } 2 Cl 2(4b),Zr i } 2 Cl 2(5a)和Zr ii } 2 Cl 2(5b)在简单的盐中合成复分解反应使用两当量的Li i }或Li ii }与金属盐MCl 4(THF)2。的反应性卤化物化合物1和3–5与各种烷基化剂 经过研究, 配体从过渡元素到主要的金属烷基试剂的
Mono-boratabenzene and -phospholyl zirconocene(IV) derivatives: Towards mixed heterocycles zirconocene complexes
on the chemistry of phospholyl and boratabenzene complexes of zirconium, which have shown potential notably as polymerization catalysts, this study aims at exploring the synthesis of mono boratabenzene and mono phospholyl zirconium complexes and at studying their reactivity towards the formation of mixed (boratabenzene)(phospholyl)zirconium complexes. Several derivatives of (η5-phospholyl)Zr(NMe2)xCl3−x