Symmetrical and Nonsymmetrical Liquid Crystalline Oligothiophenes: Convenient Synthesis and Transition-Temperature Engineering
作者:Julie Leroy、Nicolas Boucher、Sergey Sergeyev、Michele Sferrazza、Yves Henri Geerts
DOI:10.1002/ejoc.200600850
日期:2007.3
the aromatic core with two identical branched alkyl chains and (ii) desymmetrization of the molecule with two alkyl substituents of different length or structure. Key steps in the synthesis of symmetrical and nonsymmetrical terthiophenes and quaterthiophenes involve Suzuki coupling and carbanion alkylation. A well-adjusted balance between the π–π stacking of the aromatic core and the disorder caused
描述了液晶低聚噻吩中转变温度工程的两种方法:(i) 在芳香核处用两个相同的支链烷基取代,以及 (ii) 用两个不同长度或结构的烷基取代基使分子去对称化。对称和非对称三联噻吩和四联噻吩合成的关键步骤涉及 Suzuki 偶联和碳负离子烷基化。芳香核的 π-π 堆积与外围烷基链引起的无序之间的良好平衡被证明对于控制低聚噻吩介晶的热致行为很重要。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)