Cationic ring-opening polymerization of N-phenylazetidine

Effect of Different Acid Initiators on Branched Poly(propylenimine) Synthesis and CO2 Sorption Performance

“…The synthesis of higher molecular weight PPI polymers was initially reported via cationic ring opening polymerization, , while the polymerization of functionalized azetidine derivatives has been more well-studied. − Previously, we investigated the effects of synthesis conditions such as reaction time, temperature, and monomer to perchloric acid initiator ratio on molecular weight, polydispersity, and degree of branching of the obtained PPI; the efficacy of various neutralization techniques was also examined . The PPI-based adsorbents were demonstrated to be promising materials for further development and elaboration for CO 2 capture; however, their stability after oxygen exposure and the effects of varying the acid initiator on polymer structure and performance has not been explored.…”

“…The synthesis of higher molecular weight PPI polymers was initially reported via cationic ring opening polymerization, 30,31 while the polymerization of functionalized azetidine derivatives has been more well-studied. 32−34 the effects of synthesis conditions such as reaction time, temperature, and monomer to perchloric acid initiator ratio on molecular weight, polydispersity, and degree of branching of the obtained PPI; the efficacy of various neutralization techniques was also examined.…”

Aziridines and azetidines: building blocks for polyamines by anionic and cationic ring-opening polymerization

“…Unsurprisingly, most of this work on the polymerization of azetidines focuses on the polymerization of N-substituted azetidines. 4,[111][112][113][114][115] While the first polymerization of an azetidine ring was reported by Kornfeld, in 1960, regarding the polymerization of conidine, 113 Goethals provided the greatest contributions to the field due to his studies of multiple azetidines. 4,5,99,[115][116][117][118] In 1974, Goethals reported of the polymerization of unsubstituted azetidine (Scheme 9).…”

Self-Assembly and Covalent Fixation for Topological Polymer Chemistry

“…It was subsequently utilized as a reactive polymer precursor to produce block copolymers by the reaction with three-and four-membered cyclic amines at elevated temperature. [17] It is also interesting to note that the four-membered cyclic ammonium end groups underwent the ionexchange reaction substituting an originally accompanied weak nucleophile for others like sulfonates or carboxylates through a simple precipitation of the telechelics solution into an aqueous solution containing the desired anions (Scheme 6). [5] When a strong nucleophile, such as a carboxylate counterion, was introduced, a spontaneous ring-opening reaction of the four-membered cyclic ammonium groups took place at ambient temperature.…”

“…Ring-opening will be further promoted by introducing an aniline derivative group, which is a better leaving group than the alkylamino group in nucleophilic substitution reactions. [17] Thus, N-phenylpyrrolidine was synthesized and used for the end-capping reaction of living poly(THF). [22] Indeed, the N-phenylpyrrolidinium end group underwent quantitative ring-opening even with pnitrobenzoate as the counterion.…”