substitution of the bromine atoms in these complexes by lithium trimethylsilylacetylide gave dimeric and monomeric aryl(alkynyl)copper(I) complexes A and B, respectively. Complex B is the first isolable mixed diorganocuprate monomer formulated as LiCuRR' and was found to selectively undergo oxidativecross-coupling of two different organic groups on copper.
可分离的混合二有机铜 (I) 配合物已被合成并在结构上通过引入各种基于稠环八-R-取代的 s-hydrindacene 骨架的庞大“Rind”基团来表征。用 CuBr 处理 RindLi 产生有机溴铜酸盐二聚体 [Cu(Rind)/CuBr](2) 或单体 Li[Cu(Rind)Br],这取决于 Rind 配体的空间体积。随后用三甲基甲硅烷基乙炔锂取代这些配合物中的溴原子,分别得到二聚体和单体芳基(炔基)铜(I)配合物 A 和 B。复合物 B 是第一个可分离的混合二有机铜酸盐单体,配制成 LiCuRR',并被发现选择性地进行铜上两个不同有机基团的氧化交叉偶联。
Phosphine-Stabilized Germylidenylpnictinidenes as Synthetic Equivalents of Heavier Nitrile and Isocyanide in Cycloaddition Reactions with Alkynes
作者:Yuhao He、Chenshu Dai、Dongmin Wang、Jun Zhu、Gengwen Tan
DOI:10.1021/jacs.2c00305
日期:2022.3.23
dene 2 and -arsinidene 3, respectively. Structural and computational investigations reveal that the Ge–E′ bond (E′ = P and As) features a multiple-bond character. 2 and 3 exhibit diverse reactivity toward trimethylsilylacetylene and 4-tetrabutylphenylacetylene. Specifically, 2 underwent cycloadditions with both alkynes affording the first six-membered aromatic phosphagermabenzen-1-ylidenes 4 and 5
在三甲基膦的存在下,由空间阻碍的氢茚配体 M s Fluind t Bu支持的氯锗烯 M s Fluind t Bu -GeCl 1与 NaPCO(二恶烷) 2.5和 NaAsCO(18- c -6) 的反应得到三甲基膦稳定的Gerylidenyl-phosphinidene 2和-arsinidene 3,分别。结构和计算研究表明,Ge-E' 键(E' = P 和 As)具有多键特征。2和3对三甲基甲硅烷基乙炔和 4-四丁基苯乙炔表现出不同的反应性。具体来说,2通过较重的异氰化物中间体 M s Fluind t Bu -PGe与两种炔烃进行环加成反应,分别得到第一个六元芳族 phosphagermabenzen-1-ylidenes 4和5。相比之下,当用三甲基甲硅烷基乙炔和 4-四丁基苯乙炔处理产生 arsgermene 6和 arsolylgermylene 7时, 3可以作为较重的异氰化物和腈的合成等效物,
An isolable germylyne radical with a one-coordinate germanium atom
eluded isolation in the condensed phase due to their high reactivity. Here we report the isolation, characterization and reactivity of a crystalline germylyne radical by using a sterically hindered hydrindacene ligand. The germylyne radical bears an essentially one-coordinate germanium atom as shown by single-crystal X-ray diffraction analysis. Electron paramagnetic resonance spectroscopic studies
A series of octa-R-substituted bromo-s-hydrindacenes, “Rind-Br,” have been synthesized by a sequence of the Lewis acid catalyzed intramolecular Friedel–Crafts reaction, bromination and vice versa. Their structural features and physical properties depend on the eight R-substituents at the four benzylic positions on the s-hydrindacenyl skeleton. The molecular structures of the Rind-Br have been confirmed by X-ray crystallography, indicating the unique structural diversities of the bulky Rind groups.