Olefin polymerization behavior of the cyclopentadienyl cobalt complexes bearing pendant sulfur or oxygen ligands

One-Pot Synthesis of Polyethylene-Based Block Copolymers via a Dual Polymerization Pathway

“…On the basis of the above, we propose a self-switching mechanism described in Scheme . Once the active species is generated as shown in Figure b, single MA unit insertion into both the Me–Co and H–Co allows for the in situ formation of Co–C­(COOMe) bonds ( 1c ), ,, where the chelation of the carbonyl oxygen completes 18-electron configuration at Co­(III) . Generally, the intramolecular chelation stabilizes the structure, resulting a higher bond dissociation energy for Co–C bonds .…”

One-Pot Synthesis of Polyethylene-Based Block Copolymers via a Dual Polymerization Pathway

“…The cobalt complex 1 was prepared according to the procedures in literature. [1][2][3] All manipulations involving air-and/or moisture-sensitive compounds were carried out using standard Schlenk techniques under Ar or N2 gas purified by passing through a hot column packed with BASF catalyst R3-11, or in a glovebox under Ar atmosphere. All polymerizations using ethylene were performed in a 50 mL stainless steel autoclave equipped with a glass tube which was washed with boiling toluene for 5 h and dried in an oven at 120 ºC for 5 h before use.…”