合成了一种新化合物 {[Fe(PZDA)(H2O)2]·2H2O}n,并通过 X 射线衍射分析确定了其结构。该化合物由沿 a 轴的准梯形双链构成,其中 Fe(II) 离子通过羧基相连,羧基作为梯子的边缘,而吡嗪环则作为梯子的横档。变温磁 susceptibili 研究表明,该双链化合物存在自旋挫折现象。
similar tetranuclear structures are observed. In contrast, the structure of 4 can be described as two interpenetrating tetrahedra of four silver atoms and four phenylbutadiynyl moieties forming a twisted cubane structure, with each silver atom further coordinated to a PCy3 ligand. The electronic absorption spectra of 1−5 in CH2Cl2 are dominated by strong, vibronically structured absorptions at 250−332
一系列发光的四核芳基乙炔银(Ag 4 μ-(C⋮C)x C 6 H 4 R- p)4 }(PCy 3)y ](x = 1,y = 2,R = H (1),CH 3(2),OCH 3(3),C⋮器CPh(5); X = 2,ÿ = 4,R = H(4))用治疗三环己基膦(PCY合成3)与[银(C⋮C)x C 6H 4 R- p }] ∞在二氯甲烷中,在没有光的情况下,已经研究了它们的光谱和光物理性质。的X射线结构1所呈现的平面平行四边形状的Ag 4芯和由将[Ag(C⋮CPH)2 ]和[Ag(上PCY 3)]与苯基乙炔σ配位的银原子在一个片段μ 2 -键合模式(平均非对称Ag-C(α)距离为2.05和2.33Å)。为2,3,和5,具有不同的第在芳基乙炔单元中的取代基上,观察到相似的四核结构。相反,可将4的结构描述为四个银原子和四个苯基丁二炔基部分的两个互穿四面体,形成扭曲的古巴结构,每个银原子进一步与PCy
Silver-Mediated Cycloaddition of Alkynes with CF<sub>3</sub>CHN<sub>2</sub>: Highly Regioselective Synthesis of 3-Trifluoromethylpyrazoles
作者:Feng Li、Jing Nie、Long Sun、Yan Zheng、Jun-An Ma
DOI:10.1002/anie.201301870
日期:2013.6.10
Silver screen: The title reaction provides a convenient and efficient method for the construction of 5‐substituted 3‐trifluoromethylpyrazoles under mild reaction conditions. By using this protocol, the marketed drug Celecoxib (antiarthritic) could be easily synthesized (see scheme; DMF=N,N‐dimethylformamide).
Facile synthesis of (E)-β-nitroolefinic alkoxyamines via silver-catalyzed decarboxylative nitroaminoxylation of phenylpropiolic acids
作者:Hong Yan、Jincheng Mao、Guangwei Rong、Defu Liu、Yang Zheng、Yue He
DOI:10.1039/c5gc00302d
日期:——
A novel silver-catalyzed decarboxylative nitroaminoxylation reaction of phenylpropiolic acids is described, leading to (E)-β-nitroolefinic alkoxyamines.
描述了一种新颖的银催化的苯基丙炔酸脱羧硝基氨氧化反应,导致(E)-β-硝基烯丙氧胺的生成。
Palladium-Catalyzed Decarboxylative<i>sp</i>-<i>sp</i><sup>2</sup>Cross-Coupling Reactions of Aryl and Vinyl Halides and Triflates with α,β-Ynoic Acids using Silver Oxide
作者:Hyunseok Kim、Phil Ho Lee
DOI:10.1002/adsc.200900502
日期:2009.11
Palladium-catalyzed decarboxylative sp-sp2 cross-couplingreactions of aryl and vinyl halides and triflates with α,β-ynoic acids using silver oxide have been developed. A variety of α,β-ynoic acids were readily decarboxylated in the presence of silver oxide and then, generated in situ, silver acetylides were coupled with electrophiles in the presence of a palladium(0) catalyst under neutral conditions
Cobalt(II)-Catalyzed Decarboxylative C–H Activation/Annulation Cascades: Regioselective Access to Isoquinolones and Isoindolinones
作者:Xin-Qi Hao、Cong Du、Xinju Zhu、Peng-Xiang Li、Jia-Heng Zhang、Jun-Long Niu、Mao-Ping Song
DOI:10.1021/acs.orglett.6b01632
日期:2016.8.5
A new cobalt(II)-catalyzed decarboxylative C–H activation/annulation of benzamides and alkynyl carboxylicacids has been described. Alkynyl carboxylicacids were first employed as the coupling partners using inexpensive Co(OAc)2·4H2O as the catalyst. This method enables a switchable cyclization to isoquinolones and isoindolinones with excellent selectivity. Moreover, a catalytic amount of Ag2O was