Stereoregular oligomers of methyl methacrylate. V: X-ray single crystal analysis of isotactic pentamer and syndiotactic tetramer
Stereoregular oligomers of methyl methacrylate. V: X-ray single crystal analysis of isotactic pentamer and syndiotactic tetramer
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甲基丙烯酸甲酯的有规立构低聚物。
DOI：
10.1080/10601329208052186
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
K. Hatada
中科院分区：
文献类型：
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作者：
K. Ute;N. Miyatake;K. Hatada
摘要用X-射线单晶分析测定了甲基丙烯酸甲酯的全同立构五聚体(介晶-介晶异构体)和间同立构四聚体(外消旋体-介晶异构体)的立体结构。用高效液相色谱法分别从t-C4H9MgBr和t-C4H9Li/(C2H5)3Al在甲苯中制备的齐聚物中分离出MMM-五聚体和RRM-四聚体。MMM-五聚体的熔点为59.0-60.0℃，低于RRM四聚体的熔点(99.4-100.2℃)。从正庚烷溶液中生长的MMM-五聚体和RRM-四聚体的单斜晶分别属于P21/n和P21空间群。MMM-五聚体的主链(t-C4H9-(C-C)n-H)构象为tttttgtg，RRM-四聚体的构象为ttttttg。
Abstract Stereostructures of the isotactic pentamer (meso-meso-meso-meso isomer) and the syndiotactic tetramer (racemo-racemo-meso isomer) of MMA were determined by x-ray single crystal analysis. The mmmm-pentamer and the rrm-tetramer were isolated by HPLC from the oligomer mixtures prepared with t-C4H9MgBr and with t-C4H9Li/(C2H5)3Al in toluene, respectively. The melting point of the mmmm-pentamer was 59.0–60.0°C, which was lower than that of the rrm-tetramer (99.4–100.2°C). Monoclinic crystals of the mmmm-pentamer and the rrm-tetramer grown from heptane solution belonged to the space groups P21/n and P21, respectively. The conformation of the main chain (t-C4H9-(C‒C)n‒H) of the mmmm-pentamer was ttttttgtg and that of the rrm-tetramer was ttttttg.
Koichi Hatada、Koichi Ute、Tohru Nishimura、Masaharu Kashiyama、Toshinori Saito 和 Makoto Takeuchi：“甲基丙烯酸甲酯的立构规整低聚物。4. MMA 的等规和间规低聚物的超临界流体色谱法”聚合物子弹
DOI：
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发表时间：
--
期刊：
影响因子：
--
作者：
通讯作者：
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影响因子：
3.2
作者：
T. Kitayama;T. Shinozaki;Eiji Masuda;Masanori Yamamoto;K. Hatada
通讯作者：
T. Kitayama;T. Shinozaki;Eiji Masuda;Masanori Yamamoto;K. Hatada