Hybrid block copolymers of polyesters/polycarbonates and polypeptides synthesized via one-pot sequential ring-opening polymerization was written by Gradisar, Spela;Zagar, Ema;Pahovnik, David. And the article was included in Polymer Chemistry in 2018.Formula: C12H11NO5 This article mentions the following:
An efficient approach toward one-pot sequential ring-opening polymerization (ROP) of cyclic esters/carbonates and N-carboxyanhydride (NCA) monomers, differing in reactivity and type of propagating group, is presented. In the first step, a polyester/polycarbonate is synthesized using methanesulfonic acid as a catalyst. After the completion of polymerization NCA is added to the reaction mixture Methanesulfonic acid successfully catalyzes the initiation step of ROP of NCA and simultaneously prevents the chain propagation by protonation of the formed amine groups. After the completion of NCA initiation, the propagation is started by addition of N-ethyldiisopropylamine as a base to prepare the hybrid block copolymers of polyester/polycarbonate and polypeptide in a one-pot manner. In the experiment, the researchers used many compounds, for example, (S)-Benzyl 2-(2,5-dioxooxazolidin-4-yl)acetate (cas: 13590-42-6Formula: C12H11NO5).
(S)-Benzyl 2-(2,5-dioxooxazolidin-4-yl)acetate (cas: 13590-42-6) belongs to oxazolidine derivatives. Oxazolidines are commonly obtained by reaction of strained heterocycles, mainly aziridines. In another report, the incorporation of an additional substituted oxazolidine ring over a range of new biphenylazepinium salt organocatalysts for the asymmetric epoxidation of alkenes improved enantiocontrol over the parent structures.Formula: C12H11NO5
Referemce:
Oxazolidine – Wikipedia,
Oxazolidine | C3H7NO – PubChem