Problems in low-temperature polymerization of lactams with alkali metal aluminum lactamate as catalysts was written by Konomi, Tuyoshi;Tani, Hisaya. And the article was included in Journal of Polymer Science, Part A-1: Polymer Chemistry in 1971.Name: 1-Acetylpiperidin-2-one This article mentions the following:
In the alkali metal aluminum tetracaprolactamate-catalyzed polymerization of 蔚-caprolactam, at lower catalyst concentrations (0.125-0.50 mole %), polymerization occurred only at >140-150.deg. because of the poor initiator activity of aluminum caprolactamate [17831-77-5], while at higher concentrations (2.0 mole %) the initiation temperature required decreased to .sim.100.deg.. In the presence of Na caprolactamate [2123-24-2] no polymerization occurred even after long polymerization times. Since the alk. polymerization of 蔚-caprolactam initiated by N-acetylcaprolactam gives a polymer both at 75.deg. and 100.deg., the formation of N-acylcaprolactam by the interaction of the lactam anion and the initiator depends both on the nature of the initiator, i.e. the electron-withdrawing power of the N-substituent in 蔚-caprolactam, and on the temperature-dependent ionic character of the alkali metal caprolactamate. In the prolonged polymerization of lactams with potassium diethylaluminum dilactamate, in the absence of initiator, the initiator activity decreased in the order 伪-pyrrolidinone > 蔚-caprolactam > 伪-piperidone. The reactivity of NaAlEt4 or KAlEt4 towards N-acetyllactam was lower than that towards lactam at a given temperature, indicating that no consumption of N-acetyllactam by the reaction with alkali metal ethylaluminum lactamates occurs in the course of low-temperature polymerization of lactams. In the experiment, the researchers used many compounds, for example, 1-Acetylpiperidin-2-one (cas: 3326-13-4Name: 1-Acetylpiperidin-2-one).
1-Acetylpiperidin-2-one (cas: 3326-13-4) belongs to piperidine derivatives.Piperidine is a key saturated heterocyclic scaffold found in several of the top-selling small molecule pharmaceuticals and natural alkaloids, with a diverse range of biological activities. Fluorinated piperidines are also the subject of continued interest in medicinal chemistry, for example in the synthesis of selective dipeptidyl peptidase II (DPP II) inhibitors. Piperidine derivatives are also used in solid-phase peptide synthesis (SPPS) and many degradation reactions.Name: 1-Acetylpiperidin-2-one
Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem