Room-Temperature Direct Alkynylation of Arenes with Copper Acetylides
作者:Cédric Theunissen、Gwilherm Evano
DOI:10.1021/ol502030y
日期:2014.9.5
C–H bond in azoles and polyhalogenated arenes can be smoothly activated by copper acetylides to give the corresponding alkynylated (hetero)arenes by simple reaction at room temperature in the presence of phenanthroline and lithium tert-butoxide under an oxygen atmosphere. These stable, unreactive, and readily available polymers act as especially efficient and practical reagents for the introduction
The synthesis and crystal structures of halogenated tolans p-X–C<sub>6</sub>H<sub>4</sub>–CC–C<sub>6</sub>F<sub>5</sub>and p-X–C<sub>6</sub>F<sub>4</sub>–CC–C<sub>6</sub>H<sub>5</sub>(X = F, Cl, Br, I)
作者:Jonathan C. Collings、Jacquelyn M. Burke、Philip S. Smith、Andrei S. Batsanov、Judith A. K. Howard、Todd B. Marder
DOI:10.1039/b411191e
日期:——
A series of halogenated, partially fluorinated tolans of general formula p-X-C6H4-C[triple bond]C-C6F5[X=I (1), Br (2), Cl (3), F (4)] and p-X-C6F4-C[triple bond]C-C6H5[X=I (5), Br (6)] have been prepared via palladium-catalysed Sonogashira cross-coupling, or for X=Cl (7), by nucleophilic aromatic substitution reactions. The single-crystal X-ray structures of 1-3 and 5-6 have been determined. The structures
The substituent effect of 2-R-o-carborane on the photophysical properties of iridium(<scp>iii</scp>) cyclometalates
作者:Jihyun Park、Young Hoon Lee、Ji Yeon Ryu、Junseong Lee、Min Hyung Lee
DOI:10.1039/c6dt00065g
日期:——
family of heteroleptic iridium(III) cyclometalates, [4-(2-RCB)ppy]2Ir(acac) (3c–3g; CB = o-carboran-1-yl; ppy = 2-phenylpyridinato-C2,N; acac = acetylacetonate; R = iPr (3c), iBu (3d), Ph (3e), CF3C6H4 (3f), C6F5 (3g)) with various 2-R substituted o-carboranes at the 4-position in the phenyl ring of the ppy ligand, were prepared. The X-ray crystal structure of all complexes, including 3a (R = H) and
一族杂多金属铱(III)环金属盐,[4-(2-RCB)ppy] 2 Ir(acac)(3c-3g ; CB = o -carboran-1-yl; ppy = 2-苯基吡啶基-C 2,N ; acac =乙酰丙酮; R = i Pr(3c),i Bu(3d),Ph(3e),CF 3 C 6 H 4(3f),C 6 F 5(3g)),带有各种2-R取代的o制备了在ppy配体的苯环的4-位上的-碳酮。所有配合物的X射线晶体结构,包括3a(R = H)和3b(R = Me),都表明,尽管碳硼烷基C–C键的距离随着2-R取代基的空间效应的增加而增加(3a– 3d),键距更可能受到2-芳基取代的配合物(3e-3g)的取代基的电子效应的影响。相对于母体(ppy)2 Ir(acac)(4),所有配合物的吸收带和发射带都发生了红移。而3a–3d在甲苯中表现出强烈的绿色磷光,并具有良好的量子效率(ΦPL =
Copper‐Catalyzed Oxidative Cross‐Coupling of Electron‐Deficient Polyfluorophenylboronate Esters with Terminal Alkynes
作者:Zhiqiang Liu、Yudha P. Budiman、Ya‐Ming Tian、Alexandra Friedrich、Mingming Huang、Stephen A. Westcott、Udo Radius、Todd B. Marder
DOI:10.1002/chem.202002888
日期:2020.12.18
We report herein a mild procedure for the copper‐catalyzed oxidative cross‐coupling of electron‐deficient polyfluorophenylboronate esters with terminal alkynes. This method displays good functional group tolerance and broad substrate scope, generating cross‐coupled alkynyl(fluoro)arene products in moderate to excellent yields. Thus, it represents a simple alternative to the conventional Sonogashira