Nickel-Catalyzed Tetramerization of Alkynes: Synthesis and Structure of Octatetraenes
作者:Tsun-Cheng Wu、Jheng-Jhih Chen、Yao-Ting Wu
DOI:10.1021/ol201814q
日期:2011.9.16
In the presence of a catalytic system comprised of NiBr2(dppe) and Zn, arylacetylenes undergo tetramerization to form linear octatetraenes, generally in good to excellent yields. The structure of the coupling products was verified by X-ray crystallography.
One order of magnitude: Naphthalene‐ and acenaphthene‐fused phosphole P‐oxides (see figure) are shown to have reasonably high thermal and electrochemical stabilities and electron‐accepting ability. The electron mobility of the naphthalene‐fused phosphole P‐oxide is about one order higher than that of tris(8‐hydroxyquinoline)aluminium(III) Alq3 at any given electric field.
unfunctionalized arenes with 1,6-diynes, possessing aryl groups at the diyne termini, proceeds to give the corresponding dienylated arenes in the presence of a catalytic amount of an electron-deficient cyclopentadienyl rhodium(III) complex, [CpERhCl2]2, and a stoichiometric amount of silver carbonate. Experimental and theoretical mechanisticstudies revealed that a CpERh(I) complex generated in situ
This work describes the syntheses, crystal structures, photophysical properties, and electro‐chemical analyses of benzo[k]fluoranthene‐based linear acenes, together with ab initio density functional theory computations on them. The molecules were prepared in generally moderate to good yields through Pd‐catalyzed cycloadditions between 1,8‐diethynylnaphthalene derivatives and aryl iodides. This protocol
这项工作描述了基于苯并[ k ]荧蒽的线性并苯的合成,晶体结构,光物理性质和电化学分析,以及从头开始的密度泛函理论计算。通过在1,8-二乙炔基萘衍生物和芳基碘化物之间进行Pd催化的环加成反应,通常可以以中等到良好的产率制备这些分子。该协议比常规方法更简单,更有效。检查了该反应的范围和局限性。化合物4 hb,15 ac,17 ab,19 ac和24 je的结构通过X射线分析确定; 它们是弯曲的还是扭曲的,而不是平面的。还研究了这些环加合物的光物理和电化学性质,并将其与基于密度泛函理论的计算预测进行了比较。
Ruthenium-Catalyzed Cascade Reactions of Diynes with Norbornadiene - Synthesis of Norbornene Derivatives
Norbornene derivatives 7–11 were prepared from norbornadiene and the corresponding diynes by Ru-catalyzed [(2+2)+2] cycloaddition and subsequent transfer hydrogenation. The structure and stereochemistry of the cycloadducts were confirmed by X-ray crystal analysis. This procedure provides high diastereoselectivity to generate norbornenes 7–11 in up to 82 % yield. The scope and limitations of this reaction