The<i>in situ</i>-Generated Nickel(0)-catalyzed Homo-coupling of Alkenyl Halides with Zinc Powder. A Specific Outcome in Stereochemistry
作者:Kentaro Takagi、Harutaka Mimura、Saburo Inokawa
DOI:10.1246/bcsj.57.3517
日期:1984.12
The catalytic activity of nickel(0) generated in situ from nickel(II) salt was examined in a dehalogenative coupling of alkenylhalides with zinc powder. The reaction of alkenyl bromides took place provided that potassium iodide was present to assist the reduction of nickel(II) with zinc powder, and also to convert the alkenyl bromides to the corresponding alkenyl iodides. A speculative view concerning
在烯基卤化物与锌粉的脱卤偶联中检测了从镍 (II) 盐原位生成的镍 (0) 的催化活性。烯基溴化物的反应发生,前提是存在碘化钾以帮助用锌粉还原镍 (II),并将烯基溴化物转化为相应的烯基碘化物。为了解释观察到的独特立体化学,提出了关于歧化步骤的推测性观点。
Ni(0)-Triphenylphosphine Complex-Catalyzed Homo-Coupling of 1-Alkenyl Halides with Zinc Powder
The homo-coupling of 1-alkenyl halides was examined in the presence of NiBr2(PPh3)2, PPh3, and excess zinc. The reactions proceed under very mild conditions to give high yields of conjugated dienes. The addition of KI or thiourea was unnecessary for a successful reaction, in contrast with systems without an external phosphine ligand.
1-烯基卤的同偶联反应在 NiBr2(PPh3)2、PPh3 和过量锌存在下得以研究。这些反应在非常温和的条件下进行,生成高产率的共轭二烯。与没有外部膦配体的体系相反,无需加入 KI 或硫脲即可成功进行反应。
Homocoupling of Arylboronic Acids with a Catalyst System Consisting of a Palladium(II) N-Heterocyclic Carbene Complex and <i>p</i>-Benzoquinone
作者:Yoshihiko Yamamoto
DOI:10.1055/s-2007-984531
日期:2007.7
In the presence of 1-3 mol% SIPr-ligated Pd(OAc)2 and 0.6 equivalent of p-benzoquinone, various arylboronic acids underwent homocoupling in MeOH at ambient temperature to produce symmetrical biaryls in 38-96% yields.
A NOVEL SYNTHESIS OF (<i>E</i>,<i>E</i>)-1,4-DIARYL-1,3-BUTADIENES BY THE RUTHENIUM(II) CATALYZED REACTION OF (<i>E</i>)-2-ARYLETHENESULFONYL CHLORIDES WITH VINYLARENES
Symmetrical and unsymmetrical (E,E)-1,4-diaryl-1,3-butadienes can be prepared in high yields from (E)-2-arylethenesulfonyl chlorides by treating with vinylarenes in the presence of ruthenium(II) phosphine complex in benzene.
对称和不对称 (E,E)-1,4-二芳基-1,3-丁二烯可以通过 (E)-2-芳基乙烯磺酰氯在钌 (II) 膦配合物存在下用乙烯基芳烃处理以高产率制备苯。
Pd-catalyzed oxidative homo-coupling of acrylates and aromatic alkenes for the conjugated diene synthesis
作者:Ting Zhu、Zhen Li、Fanhua Xiao、Wei-Liang Duan
DOI:10.1016/j.tetlet.2018.06.026
日期:2018.8
We developed a bidentate monoanionic nitrogen ligand that was effective in the Pd-catalyzed oxidativehomo-coupling reaction of acrylates and aromatic alkenes. In the presence of Pd(OAc)2/ligand several conjugated dienes were obtained in good yields with high stereoselectivities.