通过钯催化偶联反应合成的具有手性烷基的二苯乙炔同系物提供了一系列新的液晶材料,其形成具有铁电性质的手性近晶 C (SmC*) 相。由三个芳环组成的化合物的介晶性质受炔键位置和酯键单元方向的强烈影响。已经系统地研究了末端链长的变化对近晶 A (SmA) 和 SmC* 两个和三个芳环系统的热稳定性的影响。
Buchwald protocol applied to the synthesis of N-heterotolan liquid crystals
摘要:
A homologous series of the new N-heterotolans 8a-d were synthesized using two cross-coupling reactions mediated by copper and palladium/copper. The final compounds present the phenyl-pyridyl framework connected by the acetylene group. The evaluation of thermal properties for this series is described. All compounds exhibit the smectic A and X mesophase. For comparison were also synthesized compounds 10, 12, and 14. Their LC properties are reported. (C) 2008 Elsevier Ltd. All rights reserved.
Buchwald protocol applied to the synthesis of N-heterotolan liquid crystals
作者:Ursula B. Vasconcelos、Abel Schrader、Guilherme D. Vilela、Antonio C.A. Borges、Aloir A. Merlo
DOI:10.1016/j.tet.2008.03.005
日期:2008.5
A homologous series of the new N-heterotolans 8a-d were synthesized using two cross-coupling reactions mediated by copper and palladium/copper. The final compounds present the phenyl-pyridyl framework connected by the acetylene group. The evaluation of thermal properties for this series is described. All compounds exhibit the smectic A and X mesophase. For comparison were also synthesized compounds 10, 12, and 14. Their LC properties are reported. (C) 2008 Elsevier Ltd. All rights reserved.
Chiral Tolans: A New Family of Ferroelectric Liquid Crystals. Synthesis and Mesomorphic Properties
chiral alkyl group, synthesized by a palladium-catalyzed coupling reaction, provide a new series of liquid crystalline materials which form chiral smectic C (SmC*) phases exhibiting ferroelectric properties. Mesomorphic properties of the compounds composed of threearomaticrings is strongly affected by the position of an acetylenic linkage and the direction of an esterlinking unit. The effect of variations
通过钯催化偶联反应合成的具有手性烷基的二苯乙炔同系物提供了一系列新的液晶材料,其形成具有铁电性质的手性近晶 C (SmC*) 相。由三个芳环组成的化合物的介晶性质受炔键位置和酯键单元方向的强烈影响。已经系统地研究了末端链长的变化对近晶 A (SmA) 和 SmC* 两个和三个芳环系统的热稳定性的影响。