Recyclable Sonogashira Coupling Reactions in an Ionic Liquid, Effected in the Absence of Both a Copper Salt and a Phosphine.

Abstract

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Sonogashira Couplings on the Surface of Montmorillonite-Supported Pd/Cu Nanoalloys

“…All samples showed well-developed (001) Bragg reflections at 2θ = 20.1°, which indicated that such clay material maintains good crystallinity . In Figure b, the characteristic diffraction of Pd(111) shifts to 2θ = 41° which was slightly different from the reported value (Pd(111) 2θ = 40.1°) .…”

Aza-Michael Addition of Imidazoles to α,β-Unsaturated Compounds and Synthesis of β-Amino Alcohols via Nucleophilic Ring Opening of Epoxides Using Copper(II) Acetylacetonate (Cu(acac)2) Immobilized in Ionic Liquids

“…The widespread interest of ionic liquids (ILs) in catalysis , and our continued search for new alternatives for selective organic transformations prompted us to investigate these important reactions using ILs. , Recently, ionic liquids have been reported to mediate the ring opening of epoxides with amines, although longer reaction times are required . Herein, we also report the regioselective ring opening of epoxides with amines to produce the corresponding β-amino alcohols in high yields using a recyclable catalytic system (Cu(acac) 2 immobilized in ionic liquids; see Scheme ).…”

Fluoride Abstraction Induced by Tris(pentafluoroethyl)difluorophosphorane: A Convenient Way to Synthesize Cationic N-Heterocyclic Carbene- and Cyclic (Alkyl)(amino)carbene-Ligated Copper Alkyne and Arene Complexes

“…Starting from the mesityl complexes 1a, 1b, 1e, and 1f as well as from [(IiPr Me )Cu(Mes)] (1c) reported previously, the The exchange of the mesityl ligand by a fluoride ion to yield 2a−2e can be followed easily in the 19 F NMR spectra as these complexes show a single resonance for the fluorido ligand in the range of −237 to −253 ppm (2a: −252.7 ppm, 2b: −240.3 ppm, 2c: −241.8 ppm, 2e: −236.9 ppm). Furthermore, the complexes 2a−2f are of considerable interest, attributed to the inherent instability of CuF as a discrete molecular entity beyond the gas phase, leading to its disproportionation into CuF 2 and metallic Cu.…”