Copper Nanoparticles on Ordered Mesoporous Carbon Nitride Support: a Superior Catalyst for Homo- and Cross-Coupling of Terminal Alkynes under Base-Free Conditions
作者:Hang Xu、Liangying Wu、Jing Tian、Jun Wang、Peng Wang、Xiyu Niu、Xiaoquan Yao
DOI:10.1002/ejoc.201901296
日期:2019.10.24
A novel heterogeneous catalyst (Cu NPs‐OMCN) was synthesized and utilized as a highly efficient catalyst for homo‐ and cross‐coupling of terminalalkynesunder base‐free conditions in ethanol. Various symmetrical and unsymmetrical 1,3‐diynes were obtained with good to excellent yields. Furthermore, the heterogeneous catalyst could be recovered and reused for several times with satisfactory yields.
Synthesis of unsymmetrical 1,3-diynes via alkyne cross-metathesis
作者:Sin Ting Li、Tobias Schnabel、Sergej Lysenko、Kai Brandhorst、Matthias Tamm
DOI:10.1039/c3cc43108h
日期:——
The tungsten benzylidyne complex [PhCWOSi(OtBu)3}3] (1) efficiently catalyses the metathetic conversion between symmetrical and unsymmetrical 1,3-diynes, which provides the opportunity to prepare the latter species directly from terminal alkynes by a combination of copper-catalysed homocoupling and catalytic alkyne cross-metathesis (ACM).
Synthesis of Chalcogenophenes<i>via</i>Cyclization of 1,3-Diynes Promoted by Iron(III) Chloride and Dialkyl Dichalcogenides
作者:Filipe N. Bilheri、André L. Stein、Gilson Zeni
DOI:10.1002/adsc.201401159
日期:2015.4.13
leads to 3,4‐bis(butylselanyl)selenophenes. The optimization studies showed that the reaction was best performed with equimolar amounts of iron(III) chloride and dibutyl diselenide in dichloromethane at 40 °C for 4 h. The method allows the synthesis of symmetrical and unsymmetrical selenophenes in moderate to good yields. A similar protocol was also extended to the synthesis of thiophene derivatives using