1174062-53-3Relevant academic research and scientific papers
The synthesis and characterisation of immobilised palladium carbene complexes and their application to heterogeneous catalysis
Tyrrell, Elizabeth,Whiteman, Leon,Williams, Neil
experimental part, p. 3465 - 3472 (2011/10/18)
Silica supported palladium NHC complexes have been prepared by two different routes: one involving the reaction of silica-supported imidazolium salts with palladium acetate and a direct immobilisation of a pre-formed complex by reacting a (trimethoxysilylpropyl)-N-aryl-imidazolylidene palladium complex with surface hydroxyl groups. A small range of catalysts of varying steric bulk were prepared in order to evaluate the effect on catalytic conversion. The activity of the palladium catalysts in Suzuki cross-coupling reactions has been established. The catalysts prepared by immobilising pre-formed palladium complexes gave superior results for the conversion of aryl bromides and aryl chlorides. In addition, use of sterically bulky NHCs (such as the N-2,6-(diisopropyl)phenyl-substituted ligand) resulted in increased catalytic activity, which is analogous to the trends noted in homogeneous catalysis.
N′-activation of N-arylimidazoles: Facile syntheses of N-alkyl-N′-arylimidazolium iodides from less expensive chloro substrates
Oertel, Anna Magdalena,Ritleng, Vincent,Chetcuti, Michael J.
experimental part, p. 1647 - 1650 (2009/12/24)
A series of N,N′-asymmetrically substituted imidazolium iodide salts have been synthesized, starting from N-arylimidazoles and the less expensive, but less reactive, 1-chlorobutane or (3-chloropropyl)trimethoxysilane. The addition of potassium iodide and
