Anionic copolymerization of β‐lactones in correlation with the mode of fission. studies on the syntheses of aliphatic polyesters. XI
1968; Wiley; Volume: 113; Issue: 1 Linguagem: Inglês
10.1002/macp.1968.021130112
ISSN0025-116X
AutoresYuya Yamashita, Tetsuo Tsuda, Hiroyasu Ishida, A. Uchikawa, Yasuhisa Kuriyama,
Tópico(s)Organometallic Complex Synthesis and Catalysis
ResumoAbstract The copolymerization behavior of β‐propiolactone (PL) and α.α‐bischloromethyl β‐propiolactone (α‐BCPL) is correlated with the mode of fission. With sodium acetate as catalyst, the formation of β‐acetoxy propionic acid at the initiation reaction was observed and α‐BCPL was more than five times as reactive as PL in copolymerization. Thus propagation by carboxylate anion through alkyl‐oxygen fission was presumed in the case of pyridine and the acetate of Na, Li, and Mg as catalyst. On the other hand, the formation of ethyl β‐hydroxy propionate and the decreased reactivity of α‐BCPL in copolymerization was observed with magnesium and aluminum ethoxide as catalyst. In the case of the ethoxide of Na, Li, and Al, and Et 2 Mg or Et 3 Al as catalyst, propagation by alkoxide anions through acyl‐oxygen fission of the coordinated lactones was presumed.
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