锆茂的七元氧化锆环枯烯1和氧化锆环戊二烯9配合物与两倍过量的乙腈的相互作用导致形成乙烯基-乙脒二环氧化锆7和11。两种反应都通过锆茂的乙炔配合物的中间生成以及这些配合物随后的乙烯基-乙酰胺化以及最终配合物7和11的形成来进行。二聚氧化锆氮杂环戊二烯金属环2与 1 equiv 乙腈在 100 °C 下在甲苯中的反应也导致络合物7的形成。得到的络合物7能够进行不寻常的热异构化,形成含有 T 形吡咯碳原子的应变三杂环配合物8 。即使在没有任何溶剂的情况下,这种异构化也会进行,在 140 °C 下持续 45 小时几乎可以定量产率。7、8和11的结构已通过 X 射线衍射确定。
ne. In contrast, zirconocene–alkyne complexes, such as those of 1-(trimethylsilyl)prop-1-yne and diphenylacetylene, gave 1-zirconacyclohept-2-en-5-yne in good yields. Consideration of structural parameters suggests that both a seven-membered cyclic alkyne and a five-membered structure contribute to generation of this complex. Coupling of benzyne and [3]cumulenes on a metal was also found to afford
and structurally characterized. The reaction process is based on both (i) the nucleophilic attack of tertiary phosphines on acetylenic reagents and (ii) the ability for 16-electron d0-zirconocene(IV) complexes to coordinate two electron donor ligands. We have shown that the nature of the heteroelement directly bonded to the triple bond of the terminal acetylenic system directs the nucleophilic attack
Aromatic Benzannulated Germole Dianions. The Dilithio and Disodio Salts of a Germaindenyl Dianion
作者:Seok-Bong Choi、Philip Boudjouk、Kun Qin
DOI:10.1021/om990991t
日期:2000.5.1
Conversion of the neutral 1,1-dichloro-DPGI (1) (DPGI = 2,3-diphenyl-1-germaindene) to the lithium dianion (2a) or sodium dianion (2b) leads to the highly unusual phenomenon of aromatization of the GeC4 portion of 1-germaindene at the expense of the aromatic annulated C6 ring. Treatment of 2a with trimethylchlorosilane gave the 1,1-bis(trimethylsilyl)-DPGI derivative (3) in high yield. The structure
A modular route to previously inaccessible classes of ring-fused π-extended heteroacenes bearing the heavy inorganic element tellurium (Te) is presented. These new materials can be viewed as n-doped analogs of molecular graphene subunits that exhibit color tunable visible light phosphorescence in the solid state and in the presence of air. The generalmechanism of phosphorescence in these systems was
A comparative study of the reactivity of Zr(IV), Hf(IV) and Th(IV) metallocene complexes: Thorium is not a Group IV metal after all
作者:Kimberly C. Jantunen、Brian L. Scott、Jaqueline L. Kiplinger
DOI:10.1016/j.jallcom.2007.03.138
日期:2007.10
Abstract Thorium(IV) is often considered to show similar chemistry to Group IV transition metals. However, studies in our laboratory have shown that this generalization is incorrect. This report presents direct comparisons where the Th(IV) metallocene complexes (C5Me5)2ThR2 (R = CH3, Ph, CH2Ph) undergo unique chemical reactivity with pyridine, 2-picoline, pyridineN-oxide, 2-picoline N-oxide, and benzonitrile
摘要 钍 (IV) 通常被认为表现出与 IV 族过渡金属相似的化学性质。然而,我们实验室的研究表明,这种概括是不正确的。本报告直接比较了 Th(IV) 茂金属配合物 (C5Me5)2ThR2(R = CH3、Ph、CH2Ph)与吡啶、2-甲基吡啶、吡啶 N-氧化物、2-甲基吡啶 N-氧化物和苄腈,而 IV 族金属类似物 (C5R5)2M( )2(R = H, ;M = Zr,Hf)则不然。我们还报告了锆和铪起始材料 (C5H5)2MR2 (M = Zr, Hf; R = , Ph, CH2Ph) 的修订高产合成,除 X 射线晶体结构外,还使用格氏试剂进行烷基化( )2Hf(Ph)2 和 ( )2Hf(CH2Ph)2。