【摘要】 含氟丁烯类液晶是一类新型具有低熔点和较高清亮点的液晶材料。本文提出了一条新的方法合成关键中间体,采用以3-氟苄氯为起始原料,经Arbuzov、Wittig-Horner、催化氢化、锂化-硼酸化4步反应制备,避免了环己烷的异构化和脱氟副反应。经过合成优化,总收率由4.5%提高到30%,具备较高的应用价值。物理性能测试表明,该类化合物在配方中的虚拟清亮点达到127.7℃、展区常数K11值高达19.7。光电测试表明,该类化合物能够缩短10%的液晶总响应时间,与该类化合物粘弹系数小的特点相吻合。新型含氟丁烯液晶为开发高性能混合液晶提供了新的单体液晶材料。更多还原

【Abstract】 3-Butenyl-based liquid crystals are a new series of liquid crystals with low melting point and high clearing point. A new synthetic method for key intermediate aryl boric acid was improved via Arbuzov,WittigHorner,catalytic hydrogenation and lithiation-boric acid 4-step reactions by using 3-fluorobenzyl chloride as the starting material. Isomerization of trans-cyclohexane and defluorination side reactions were avoided. After optimization the total yield was improved from 4. 5% to 30%,which is valuable for industrial production.Physical properties test indicates that the new compounds have virtual clearing point of 127. 7 ℃ and a large splay elastic constant K11 value of 19. 7. Transmittance-voltage test shows that the compound can shorten the total response time by 10%,which coincides with its low elastic-viscosity value. The new 3-butenyl-based liquid crystals have potential applications in developing high performance liquid crystal mixtures.更多还原