title: Bis(chalcogenones) as pincer ligands: isolation and Heck activity of the selone-ligated unsymmetrical C,C,Se-Pd pincer complex.
abstract: The reaction of meta-phenylene-bis(1-methyl-1H-imidazole-2(3H)-selone) with [Pd2(μ-Cl)2(2-C6H4CH2NMe2)2] in dry benzene and glacial acetic acid resulted in the formation of an unsymmetrical 5,6-membered C,C,Se-Pd(II) pincer complex through C-H bond activation and extrusion of one selenium. This is the first example of a C,C,Se-Pd(II) complex wherein the central Pd(II) is simultaneously coordinated to a selone and an N-heterocyclic carbene. The chelated complex of the type [PdL2](2+)2[PF6](-) (L = bis(selone)) was isolated from the reaction of the bis(selone) with [PdCl2(PhCN)2] and NH4PF6. The unsymmetrical pincer complex was studied for Heck activity revealing its application as an acceptable catalyst in coupling of iodobenzene with acrylates and styrene.
authors.affiliation: Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400076, India. chhbsia@chem.iitb.ac.in.
authors.forename: Ninad
authors.initials: N
authors.lastname: Ghavale
authors.forename: Sudesh T
authors.initials: ST
authors.lastname: Manjare
authors.forename: Harkesh B
authors.initials: HB
authors.lastname: Singh
authors.forename: Ray J
authors.initials: RJ
authors.lastname: Butcher