Comments on the ring-opening polymerization of morpholine-2,5-dione derivatives by various metal catalysts and characterization of the products formed in the reactions involving R<sub>2</sub>SnX<sub>2</sub>, where X = OPr<sup>i</sup>and NMe<sub>2</sub>and R = Bu<sup>n</sup>, Ph and p-Me<sub>2</sub>NC<sub>6</sub>H<sub>4</sub>
作者:M. H. Chisholm、J. Galucci、C. Krempner、C. Wiggenhorn
DOI:10.1039/b510580c
日期:——
(2), do not enter into ring-opening polymerization reactions with metal catalyst precursors commonly employed for lactides, and with Sn(II) octanoate, only low molecular weight oligomers are obtained. Reactions with R2SnX2 compounds, where R = Ph, Bu(n) and p-Me2NC6H4 and X = OPr(i) or NMe2, reveal that ring-opening of the morpholine-2,5-diones does occur, but that polymerization is terminated by the
(3S,6S)-3-异丙基-6-甲基吗啉-2,5-二酮(1)和(3S,6S)-3,6-二甲基吗啉-2,5-二酮(2)如果不与丙交酯常用的金属催化剂前体以及辛酸锡(II)进行开环聚合反应,则只能得到低分子量的低聚物。与R2SnX2化合物的反应(其中R = Ph,Bu(n)和p-Me2NC6H4和X = OPr(i)或NMe2)显示确实发生了吗啉-2,5-二酮的开环,但聚合反应终止了通过形成动力学惰性的产物,例如Ph2Sn [mu,eta(3)-OCH(Me)CONCH(Pr(i))COOPr(i)]} 2(3)和[Bu(n)) 2Sn [mu,eta(3)-OCH(Me)CONCH(Me)CONMe2]} 2(4),除去HX。Ph3SnOPr(i)与吗啉2可逆反应,通过1 H NMR光谱分析甲苯-d8中的5-二酮,同时(Bu(n))3SnNMe2通过开环反应得到(Bu(n))3SnOCH