Acetonitrile

About: Acetonitrile is a research topic. Over the lifetime, 11298 publications have been published within this topic receiving 175275 citations. The topic is also known as: cyanomethane & ethyl nitrile.

Solubility and solvation in mixed solvent systems

Abstract: Au cours de ce congres, des aspects theoriques et experimentaux sur la solubilite ont ete abordes

Aqua, Alcohol, and Acetonitrile Adducts of Tris(perfluorophenyl)borane: Evaluation of Brønsted Acidity and Ligand Lability with Experimental and Computational Methods

Abstract: Equilibrium studies have been performed to determine the Bronsted acidity of [(C6F5)3B(OH2)]·H2O, the aqua species that exists in acetonitrile solutions of B(C6F5)3 in the presence of water NMR spectroscopic analysis of the deprotonation of [(C6F5)3B(OH2)]·H2O with 2,6-But2C5H3N in acetonitrile allows a pK value of 86 to be determined for the equilibrium [(C6F5)3B(OH2)]·H2O ⇄ [(C6F5)3B(OH)]- + [H3O]+ On the basis of a calculated value for the hydrogen bond interaction in [(C6F5)3B(OH2)]·H2O, the pKa for (C6F5)3B(OH2) is estimated to be 84 in acetonitrile Such a value indicates that (C6F5)3B(OH2) must be regarded as a strong acid, with a strength comparable to that of HCl in acetonitrile Dynamic NMR spectroscopic studies indicate that the aqua and acetonitrile ligands in (C6F5)3B(OH2) and (C6F5)3B(NCMe) are labile, with dissociation of H2O being substantially more facile than that of MeCN, by a factor of ca 200 in rate constant at 300 K Ab initio calculations were performed in the gas phase and wit

Direct Amide Synthesis from Alcohols and Amines by Phosphine‐Free Ruthenium Catalyst Systems

Abstract: Amides are synthesized directly from alcohols and amines in high yields using an in situ generated catalyst from easily available ruthenium complexes such as the (p-cymene)ruthenium dichloride dimer, [Ru(p-cymeme)Cl 2 ] 2 , or the (benzene)ruthenium dichloride dimer, [Ru(benzene)Cl 2 ] 2 , an N-heterocyclic carbene (NHC) ligand, and a nitrogen containing L-type ligand such as acetonitrile. The phosphine-free catalyst systems showed improved or comparable activity compared to previous phosphine-based catalytic systems. The in situ generated catalyst from [Ru(benzene)Cl 2 ] 2 , an NHC ligand, and acetonitrile showed excellent activity toward reactions with cyclic secondary amines such as piperidine and morpholine.

Switching the reaction course of electrochemical CO₂ reduction with ionic liquids.

Abstract: The ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([emim][Tf2N]) offers new ways to modulate the electrochemical reduction of carbon dioxide. [emim][Tf2N], when present as the supporting electrolyte in acetonitrile, decreases the reduction overpotential at a Pb electrode by 0.18 V as compared to tetraethylammonium perchlorate as the supporting electrolyte. More interestingly, the ionic liquid shifts the reaction course during the electrochemical reduction of carbon dioxide by promoting the formation of carbon monoxide instead of oxalate anion. With increasing concentration of [emim][Tf2N], a carboxylate species with reduced CO2 covalently bonded to the imidazolium ring is formed along with carbon monoxide. The results highlight the catalytic effects of the medium in modulating the CO2 reduction products.