title: Sulfur-functionalized N-heterocyclic carbene complexes of Pd(II): syntheses, structures and catalytic activities.
abstract: N-heterocyclic carbenes (NHCs) can be easily modified by introducing functional groups at the nitrogen atoms, which leads to versatile coordination chemistry as well as diverse catalytic applications of the resulting complexes. This article summarizes our contributions to the field of NHCs bearing different types of sulfur functions, i.e., thioether, sulfoxide, thiophene, and thiolato. The experimental evidence for the truly hemilabile coordination behavior of a Pd(II) thioether-NHC complex has been reported as well. In addition, complexes bearing rigid CSC-pincer ligands have been synthesized and the reasons for pincer versus pseudo-pincer formation investigated. Incorporation of the electron-rich thiolato function resulted in the isolation of structurally diverse complexes. The catalytic activities of selected complexes have been tested in Suzuki-Miyaura, Mizoroki-Heck and hydroamination reactions.
authors.affiliation: Department of Chemistry, 3 Science Drive 3, National University of Singapore, 117543, Singapore.
authors.forename: Dan
authors.initials: D
authors.lastname: Yuan
authors.forename: Han Vinh
authors.initials: HV
authors.lastname: Huynh
mesh_terms: D000586:Amination; D002384:Catalysis; D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry; D007093:Imidazoles / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D010165:Palladium / Q000737:chemistry*; D013457:Sulfur Compounds / Q000737:chemistry*; D013876:Thiophenes / Q000737:chemistry
chemical_list: D056831:Coordination Complexes; D007093:Imidazoles; D013457:Sulfur Compounds; D013876:Thiophenes; D010165:Palladium