Tetrakis(trimethylsilyl)tetrahedrane 3 has been synthesized upon irradiation of tetrakis(trimethylsilyl)cyclobutadiene 8, which can be prepared either by thermal nitrogen elimination from trimethylsilyl-[1,2,3-tris(trimethylsilyl)-2-cycloprop-1-enyl]diazomethane 7 or by mild oxidation of cyclobutadiene dianion 9 with 1,2-dibromoethane. The structural characterization of tetrahedrane 3 has been achieved by X-ray crystallography. The surprising thermal stability of 3 - which is stable up to 300 degreesC - is discussed.
DOI:
10.1021/ja020863n
作为产物:
描述:
dilithium salt of tetrakis(trimethylsilyl)cyclobutadiene dianion 在
1,2-二溴乙烷 作用下,
以
四氢呋喃 、 正己烷 为溶剂,
以350 mg的产率得到1,2,3,4-tetrakis(trimethylsilyl)cyclobuta-1,3-diene
参考文献:
名称:
Tetrakis(trimethylsilyl)tetrahedrane
摘要:
Tetrakis(trimethylsilyl)tetrahedrane 3 has been synthesized upon irradiation of tetrakis(trimethylsilyl)cyclobutadiene 8, which can be prepared either by thermal nitrogen elimination from trimethylsilyl-[1,2,3-tris(trimethylsilyl)-2-cycloprop-1-enyl]diazomethane 7 or by mild oxidation of cyclobutadiene dianion 9 with 1,2-dibromoethane. The structural characterization of tetrahedrane 3 has been achieved by X-ray crystallography. The surprising thermal stability of 3 - which is stable up to 300 degreesC - is discussed.
From Tetragermacyclobutene to Tetragermacyclobutadiene Dianion to Tetragermacyclobutadiene Transition Metal Complexes
作者:Vladimir Ya. Lee、Yuki Ito、Hiroyuki Yasuda、Kazunori Takanashi、Akira Sekiguchi
DOI:10.1021/ja111596g
日期:2011.4.6
(tetragermacyclobutadiene)tricarbonylironcomplex, [η(4)-((t)Bu(2)MeSi)(4)Ge(4)}]Fe(CO)(3)4, which has a slightly folded Ge(4) ring perhaptocoordinated to the Fe center. Structural and spectral characteristics of 4 show a remarkable π-donating ability of the tetragermacyclobutadiene ligand toward the transition metal, surpassing that of tetrasilacyclobutadiene and cyclobutadiene ligands. Reduction of
A new procedure for synthesizing tetrakis(trimethylsilyl)tetrahedrane from tetrakis(trimethylsilyl)cyclobutadiene is reported. Valence isomerization of cyclobutadiene to tetrahedrane induced by one-electron oxidation has been developed by the addition of tris(pentafluorophenyl)borane as an oxidant. This new method has great synthetic advantages for easy, quick, and high-yielding reaction to achieve
Rare‐Earth Cyclobutadienyl Sandwich Complexes: Synthesis, Structure and Dynamic Magnetic Properties
作者:Benjamin M. Day、Fu‐Sheng Guo、Sean R. Giblin、Akira Sekiguchi、Akseli Mansikkamäki、Richard A. Layfield
DOI:10.1002/chem.201804776
日期:2018.11.13
(1) reacts with MCl3(THF)3.5 (M=Y, Dy) to give the first rare‐earth cyclobutadienyl complexes, that is, the complex anions [Mη4‐C4(SiMe3)4}η4‐C4(SiMe3)3‐κ‐(CH2SiMe2}]2−, (2M), as their dipotassium salts. The tuck‐in alkyl ligand in 2M is thought to form through deprotonation of the “squarocene” complexes [Mη4‐C4(SiMe3)4}2]− by 1. Complex 2Dy is a single‐molecule magnet, but with prominent quantum
钾cyclobutadienyl [K 2 η 4 -C 4(森达3)4 }](1)反应使用的MC1 3(THF)3.5(M = Y,DY),得到第1稀土类cyclobutadienyl络合物,即,该络合阴离子[M η 4 -C 4(森达3)4 } η 4 -C 4(森达3)3 -κ-(CH 2森达2 }] 2-,(2中号),因为它们的二钾盐。2 M中的折入烷基配体通过“squarocene”复合物的脱质子化认为形式[M η 4 -C 4(森达3)4 } 2 ] -由1。复合物2 Dy是单分子磁体,但是具有显着的量子隧穿。在1 kOe的外加磁场中,对于2 Dy确定了323(22)cm -1的各向异性势垒,并且观察到磁滞回线直至7K。
Double Ligand Activation in Silyl-Substituted Rare-Earth Cyclobutadienyl Complexes
作者:Anindita Chakraborty、Benjamin M. Day、James P. Durrant、Mian He、Jinkui Tang、Richard A. Layfield
DOI:10.1021/acs.organomet.9b00763
日期:2020.1.13
The sodium cyclobutadienyl (Cb) reagent [Na2η4-C4(SiMe3)4}(THF)]2 (2) reacts with rare-earth halides [MCl3(THF)x], where M = Y, Dy (x = 3.5) and Lu (x = 3), giving the sandwich coordination polymers [Mη3-C4(SiMe3)4H}η4-C4(SiMe3)3-κ-(CH2SiMe2}Na]∞ (3M, M = Y, Dy, Lu). The coordination environments of the rare-earthmetals in 3M feature an η4-cyclobutadienyl ligand, with additional coordination by