Formation of huge cyclic oligomers in the condensation polymerization of bis(9-hydroxy-1,4,7-trioxanonyl) substituted naphthalene and benzenes with both aromatic and aliphatic bis-acid chlorides
摘要:
在不使用高稀释技术的情况下,双(9-羟基-1,4,7-三氧杂壬基)取代的萘和苯(1a-d)分别与对苯二甲酰二氯(2)、己二酰二氯(5a)和异对苯二甲酰二氯(5b)的双酸氯化物在 80 °C 下缩合聚合,得到了巨型大环,即 n = 1-5 的冠烷 3a(n)、n = 1-3 的冠烷 3b-d(n) 和 n = 1-2 的冠烷 6a-b(n)。即 n = 1-5 的冠烷 3a(n)、n = 1-3 的冠烷 3b-d(n) 和 n = 1-2 的冠烷 6a-b(n),总产率高(约 30%w/w,单体浓度 0.033 M)。使用制备柱色谱法分离出了周长为 28-150 个原子的冠烷。在熔体和溶液中,当单体浓度(0.33 M)增加 10 倍时,环状低聚物的产量仍然相当可观(熔体中约为 2% w/w,溶液中约为 10% w/w)。1a 和 1d 的 9-hydroxy-1,4,7-trioxanonyl 侧链在 25 和 80 °C 下的 1H NMR 构象分析表明,在这两个温度下,所有 HO-[CH(I)2-CH(II)2-O]n- 单元几乎都以其高位构象存在。半经验 AM1 计算也证实了这一点。因此,侧链的有利预取向显然是形成环状低聚物的一个重要因素。报告了 3a(1)、3d(1) 和 6a(1)的单晶 X 射线结构;固态包装图案受到二元醇和双酸成分类型的强烈影响。
Formation of huge cyclic oligomers in the condensation polymerization of bis(9-hydroxy-1,4,7-trioxanonyl) substituted naphthalene and benzenes with both aromatic and aliphatic bis-acid chlorides
作者:Ingrid J. A. Mertens、René Wegh、Leonardus W. Jenneskens、Edward J. Vlietstra、Anca van der Kerk-van Hoof、Jan W. Zwikker、Thomas J. Cleij、Wilberth J. J. Smeets、Nora Veldman、Anthony L. Spek
DOI:10.1039/a701920c
日期:——
Without the use of high dilution techniques condensation polymerization of bis(9-hydroxy-1,4,7-trioxanonyl) substituted naphthalene and benzenes (1a–d) with the bis-acid chlorides terephthaloyl dichloride (2), adipoyl dichloride (5a) and isophthaloyl dichloride (5b) at 80 °C, respectively, gives giant-size macrocycles, i.e. crownophanes 3a(n) with n = 1–5, 3b–d(n) with n = 1–3 and 6a–b(n) with n = 1–2, respectively, in high overall yield (ca. 30% w/w, monomer conc. 0.033 M). The crownophanes with 28–150 atom perimeters have been isolated using preparative column chromatography. Both in the melt and in solution, with a ten-fold increase in monomer conc. (0.33 M), cyclic oligomer yields remain considerable (melt, ca. 2% w/w, and solution ca. 10% w/w). 1H NMR conformational analysis of the 9-hydroxy-1,4,7-trioxanonyl side chains of both 1a and 1d at 25 and 80 °C have shown that all HO–[CH(I)2–CH(II)2–O]n– units are almost exclusively present in their gauche conformation at both temperatures. This is supported by semi-empirical AM1 calculations. Hence, favourable pre-orientation of the side chains is apparently an important factor in the formation of cyclic oligomers. Single crystal X-ray structures of 3a(1), 3d(1) and 6a(1) are reported; solid-state packing motifs are strongly affected by the type of diol and bis-acid constituent.
在不使用高稀释技术的情况下,双(9-羟基-1,4,7-三氧杂壬基)取代的萘和苯(1a-d)分别与对苯二甲酰二氯(2)、己二酰二氯(5a)和异对苯二甲酰二氯(5b)的双酸氯化物在 80 °C 下缩合聚合,得到了巨型大环,即 n = 1-5 的冠烷 3a(n)、n = 1-3 的冠烷 3b-d(n) 和 n = 1-2 的冠烷 6a-b(n)。即 n = 1-5 的冠烷 3a(n)、n = 1-3 的冠烷 3b-d(n) 和 n = 1-2 的冠烷 6a-b(n),总产率高(约 30%w/w,单体浓度 0.033 M)。使用制备柱色谱法分离出了周长为 28-150 个原子的冠烷。在熔体和溶液中,当单体浓度(0.33 M)增加 10 倍时,环状低聚物的产量仍然相当可观(熔体中约为 2% w/w,溶液中约为 10% w/w)。1a 和 1d 的 9-hydroxy-1,4,7-trioxanonyl 侧链在 25 和 80 °C 下的 1H NMR 构象分析表明,在这两个温度下,所有 HO-[CH(I)2-CH(II)2-O]n- 单元几乎都以其高位构象存在。半经验 AM1 计算也证实了这一点。因此,侧链的有利预取向显然是形成环状低聚物的一个重要因素。报告了 3a(1)、3d(1) 和 6a(1)的单晶 X 射线结构;固态包装图案受到二元醇和双酸成分类型的强烈影响。