Bidentate selenium-based chalcogen bond catalyzed cationic polymerization of p-methoxystyrene

Abstract

The application of selenium-based non-covalent bond catalysis in living cationic polymerization has rarely been reported. In this work, the cationic polymerization of p-methoxystyrene (pMOS) was performed using a bidentate selenium...

Recent Developments on Cationic Polymerization of Vinyl Ethers

“…In the same year, the Takagi group explored these polymerizations utilizing nonionic halogen bonding catalysts (OC-3,4) (Figure A) to address issues related to solubility and dissociation that were encountered with the ionic catalysts. Later on, the Takagi group and the Wu group have used chalcogen bonding organocatalysts for cationic polymerization of p -methoxystyrene (pMOS). Alternatively, the Tao group employed the hydrogen bond donor selenocyclodiphosph­(V)­azane complex OC-5 (Figure A) as an anion-binding catalyst to extract the halide anion from the carbon–halogen bond of the dormant species (Figure D), leading to the formation of a carbocationic active center to undergo living cationic polymerization. , …”

Metal-free living cationic ring-opening polymerization of cyclic esters using selenonium salts as Lewis acids

“…36 In addition, Wu et al and Takagi et al utilized selenonium salts and telluronium salts, respectively, for the controlled cationic polymerization of p -methoxystyrene under mild conditions. 37,38 These prior works demonstrated the promising potential of selenonium salts or telluronium salts for application in the metal-free cationic ROP of cyclic esters, which has not been explored to date. Herein, for the first time, we present the living cationic ROP of cyclic esters, such as ε-caprolactone (ε-CL), δ-valerolactone (δ-VL), trimethylene carbonate (TMC) and l -lactone ( l -LA), by using selenonium salts as metal-free Lewis acid catalysts.…”