25583-69-1Relevant academic research and scientific papers
The impact of cation structure upon the acidity of triazolium salts in dimethyl sulfoxide
Konstandaras, Nicholas,Dunn, Michelle H.,Guerry, Max S.,Barnett, Christopher D.,Cole, Marcus L.,Harper, Jason B.
, p. 66 - 75 (2019)
A series of triazolium salts, selected for their varying electronic and steric properties, were prepared and their pKa values were determined in DMSO at 25 °C using the bracketing indicator method. The effect of each systematic structural variation upon the acidity of the triazolium cation has been considered, in particular examining the effects of systematically altering electronic properties, quantified through the use of Hammett σ parameters. The first pKa value for an azolium salt that generates a mesionic carbene is also reported. These new data allow for the selection of appropriate bases for the deprotonation of such triazolium salts and the potential to correlate the pKa values determined herein with the nucleophilicity of the corresponding carbenes.
Access to silver-NHC complexes from soluble silver species in aqueous or ethanolic ammonia
Gibard, Clémentine,Fauché, Kévin,Guillot, Régis,Jouffret, Laurent,Tra?kia, Mounir,Gautier, Arnaud,Cisnetti, Federico
, p. 70 - 74 (2017)
In this communication, we report the use of aqueous ammonia as original conditions for the metalation of imidazol(in)ium ligands. This reaction, performed in homogenous conditions via a soluble silver-ammine complex is a rapid, scalable and often efficient access to silver-NHC complexes. Moreover, modification of the reported reaction conditions allowed the preparation of unprecedented heteroleptic NHC-Ag-phosphine in case of bulky IPr and SIPr ligands.
