Mechanochemical Synthesis of Diarylethynes from Aryl Iodides and CaC2

A mechanochemical synthesis of diarylethynes from aryl iodides and calcium carbide as acetylene source is reported. The reaction is catalyzed by a palladium catalyst in the presence of copper salt, base and ethanol as liquid assisting grinding (LAG) additive. Various aryl and heteroaryl iodides have been converted in up to excellent yields.

Cu-Catalyzed [2+2+1] Cascade Annulation of Vinyl Iodonium Salts with Element Sulfur/Selenium for the Modular Synthesis of Thiophenes and Selenophenes

A [2+2+1] annulation protocol has been established for the modular synthesis of 2,4-disubstituted thiophenes/selenophens, with excellent regioselectivity. The reactions are catalyzed by copper salt with elemental sulfur and selenium serving...

Homocoupling of terminal alkynes catalyzed by CuCl under solvent-free conditions

A series of symmetrical 1,4-disubstituted buta-1,3-diynes is prepared with excellent yields (up to 95%) through homocoupling of terminal alkynes catalyzed by a copper salt under solvent-free conditions. This method provides an environmentally friendly process to prepare 1,3-diynes in short reaction times under mild conditions. Furthermore, the method is suitable for a wide substrate scope and has excellent functional group compatibility. The reaction can also be scaled up to gram level.

Spectroscopy and Photochemistry of Copper Nitrate Clusters

The investigation of copper nitrate cluster anions Cu(II)n(NO3)2n+1–, n ≤ 4, in the gas phase using ultraviolet/visible/near-infrared (UV/Vis/NIR) spectroscopy provides detailed insight into the electronic structure of the copper salt...

A Palladium-Free Sonogashira Coupling Protocol Employing an In Situ Prepared Copper/Chelating 1,2,3-Triazolylidene System

A new, palladium-free Sonogashira coupling reaction protocol using a catalytic system that comprises a simple, cheap, widely available copper salt and a chelating 1,2,3-triazolylidene ligand precursor is reported. This protocol provides the desired coupling products in moderate to very good yields.