Sterically Controlled Self-Assembly of a Robust Multinuclear Palladium Catalyst for Ethylene Polymerization

作者：Qian Liu, Richard F. Jordan · 发表于：Journal of the American Chemical Society · 年份：2019 · DOI：10.1021/jacs.9b02465 · 被引用次数：17 · 研究领域：Organometallic Complex Synthesis and Catalysis、Lanthanide and Transition Metal Complexes、Coordination Chemistry and Organometallics

The self-assembly and reactivity of a robust multinuclear Pd catalyst based on the sterically expanded phosphine- bis -arenesulfonate ligand PPh(2-SO 3 – -4,5-(OMe) 2 -Ph) 2 (OPO 2–, 2 ) are described. The reaction of Li 2 [ 2 ] with (COD)PdMeCl and 4-(5-nonyl)-pyridine (py′) generates the tetranuclear complex {(OPO-Li)PdMe(py′)} 4 Li 2 Cl 2 ( 3 ) in which four (phosphine-sulfonate)PdMe(py′) units are arranged around the periphery of a Li 4 S 4 O 12 ·Li 2 Cl 2 cage. The Pd atoms in 3 are arranged in pairs with a Pd–Pd distance of 6.6 Å within each pair. 3 is more resistant to disassembly to Pd 1 species than previously studied {(OPO-Li)PdMe(py)} 4 compounds based on Li 4 S 4 O 12 cages. 3 is a single-site catalyst for the polymerization of ethylene to high-molecular weight polyethylene hexanes suspension at 80 °C.