具有内环烷基的形状保持大环：具有反式结构的盘状液晶的一些结构限制。
Shape-persistent macrocycles with intraannular alkyl groups: some structural limits of discotic liquid crystals with an inverted structure.
机构信息
Kekulé-Institut für Organische Chemie und Biochemie der Universität Bonn, Gerhard-Domagk-Str. 1, 53121 Bonn, Germany.
Institut für Technische Chemie und Polymerchemie, Universität Karlsruhe (TH), Engesserstr. 18, 76131 Karlsruhe, Germany.
出版信息
Beilstein J Org Chem. 2008 Jan 9;4:1. doi: 10.1186/1860-5397-4-1.
The synthesis and thermal properties of new shape-persistent macrocycles of different sizes decorated with intraannular alkyl chains are described. The alkyl chain length is in all cases sufficient to cross the rings and to fill their interior completely. The investigation of the thermal behavior has shown that the smaller cycles do not exhibit thermotropic mesophases. Single crystal x-ray analysis indicates that the anisotropy in these compounds is too small to describe them as plates rather than spheres. For the larger macrocycles it is shown that longer adaptable substituents decrease the phase transition temperatures compared to previously described structures.
描述了不同大小的具有内环烷基链的新型形状稳定大环的合成和热性能。所有情况下，烷基链长度足以穿过环并完全填充其内部。热行为的研究表明，较小的环不表现出热致中间相。单晶 X 射线分析表明，这些化合物的各向异性太小，不能将它们描述为平板而不是球体。对于较大的大环，表明更长的适应性取代基与以前描述的结构相比降低了相变温度。
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