Synthesis and Solid-State Polymerization of 5-(Pyren-1-yl)penta-2,4-diyn-1-ol Derivatives with an <i>N</i>-Phenylurethane or <i>N</i>-Benzylurethane Group
dodecyl (m = 12), and hexadecyl (m = 16) groups. UponUVirradiation, a regular 1,4-addition polymerization to form polydiacetylene was confirmed for H-0, H-1, C8O-1, C12O-1, and C16O-1. For C1O-0 and C1O-1, the crystalstructures were solved, and the reasons the regular polymerization did not occur were clarified. From the powder X-ray diffraction study, crystallinities of CmO-1 were found to be lower
合成了一系列5-(吡啶-1-基)戊-2,4-二炔-1-基N-苯基氨基甲酸酯和N-苄基氨基甲酸酯。在苯基基团Ñ -苯基和ñ -苄基部分(分别为未取代的H-0和H-1分别)和(3,4,5-三烷氧基取代的C ^米-O-0和C ^米O-1 ,分别地),其中引入的烷基是甲基(m = 1),辛基(m = 8),十二烷基(m = 12)和十六烷基(m= 16)组。在UV辐射下,对于H-0,H-1,C 8 O-1,C 12 O-1和C 16 O-1,证实了常规的1,4-加成聚合形成聚二乙炔。对于C 1 O-0和C 1 O-1,解决了晶体结构,并且阐明了不发生规则聚合的原因。根据粉末X射线衍射研究,发现C m O-1的结晶度低于C m O-0的结晶度,尽管C mO-1定期聚合。这表明总结晶度与在聚合方向上一维阵列周围的局部排序不直接相关。聚合的C m O-1物种可溶于氯仿。它们的可加工性使我们能够制造聚二乙炔以及单体的流延膜。评估了C
Complexation-Induced Unfolding of Heterocyclic Ureas. Simple Foldamers Equilibrate with Multiply Hydrogen-Bonded Sheetlike Structures<sup>1</sup>
作者:Perry S. Corbin、Steven C. Zimmerman、Paul A. Thiessen、Natalie A. Hawryluk、Thomas J. Murray
DOI:10.1021/ja010638q
日期:2001.10.31
performed on ureas 1, 3, 16, and 17, indicating that these ureas are intramolecularly hydrogen-bonded in the solid state. Moreover, detailed 1H NMR solution studies of 1, 3, 4, 6, and 7 indicate that similar folded structures form in chloroform. In addition, naphthyridinylureas 3 and 7 unfold and dimerize by forming four hydrogen bonds at high concentrations, and ureas 1 and 4 unfold in the presence
Novel multiply hydrogen-bonded heterodimers based on heterocyclic ureas. Folding and stability
作者:Xiao-Qiang Li、Xi-Kui Jiang、Xiao-Zhong Wang、Zhan-Ting Li
DOI:10.1016/j.tet.2003.12.063
日期:2004.2
stability of the new heterodimers. 2D-NOESY, COSY and temperature variable 1H NMR studies revealed that all the new heterodimers are substantially more stable than the ureidopyrimidone-based quadruply hydrogen-bonded homodimers in chloroform-d. As a result, heterodimers 2·4 and 3·4 were assembled quantitatively, while heterodimers 2·5, 3·5, 2·6, and 3·6 were formed in 80–85% yields. It is also revealed
3,4,5-Trialkoxyphenyl isocyanate derivatives, in which alkoxy was dodecyloxy or methoxy, reacted with 4,6-decadiyn-1,10-diol and 5,7-dodecadiyn-1,12-diol, and four butadiyne derivatives with (N-trialkoxyphenyl)urethane groups were successfully synthesized. Their solid-state polymerization stimulated by UV or γ-ray irradiation was investigated. All monomers in crystals were found to be polymerizable. However, conversion was different depending on the compounds. The derivatives from 5,7-dodecadiyn-1,12-diol showed better conversion, suggesting that they have more favorable monomer arrangement for the solid-state polymerization. Polymers of dodecyloxy derivatives could be partially dissolved in chloroform and they showed solvatochromism when hexane was added to the solution. As was expected from the structure of tridodecyloxyphenyl groups introduced, dodecyloxy derivatives gave organogels in various organic solvents in the concentration less than 2 wt %. However, these gels could not be polymerized by UV irradiation, and the monomer alignment was found to be different between crystalline and gel states.