Palladium-catalysed Suzuki--Miyaura cross-coupling with imidazolylidene ligands substituted by crowded resorcinarenyl and calixarenyl units

Authors : Neslihan SAHIN, David SEMERIL, Eric BRENNER, Dominique MATT, Cemal KAYA, Loic TOUPET

Pages : 1171-1179

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Two $N$-heterocyclic carbene insert ignore into journalissuearticles values(NHC); palladium complexes of formula [PdBr$_{2}$insert ignore into journalissuearticles values(NHC);insert ignore into journalissuearticles values(pyridine);] in which the carbenic ring is flanked by sterically crowded cavitand substituents were prepared from appropriate imidazolium salts bearing either two resorcinarene or a combination of resorcinarene and calixarene fragments. Both complexes displayed high stability and good activities in the cross-coupling of aryl bromides with phenyl boronic acid. One of the imidazolium salts was characterised by an X-ray diffraction study.
Keywords : Resorcinarene, calixarene, cavitands, N heterocyclic carbene, palladium, PEPPSI complexes, Suzuki Miyaura coupling