中华医学超声杂志

应用化学 ›› 2015, Vol. 32 ›› Issue (3): 255-260.DOI: 10.11944/j.issn.1000-0518.2015.03.140207

• 研究论文 • 上一篇    下一篇

含氟丁烯联苯类液晶新方法合成及性能

李建,胡明刚,李娟利,杨志,杨晓哲,车昭毅,陈涛,安忠维()   

  1.  西安近代化学研究所 西安 710065
  • 收稿日期:2014-06-11 接受日期:2014-10-30 出版日期:2015-03-02 发布日期:2015-03-02
  • 通讯作者: 安忠维
  • 基金资助:
    国防基础科研基金资助项目(B0520132007)

New Synthetic Method and Properties of the 3-Butenyl-Based Fluorinated Biphenyl Liquid Crystals

LI Jian, HU Minggang, LI Juanli, YANG Zhi, YANG Xiaozhe, CHE Zhaoyi, CHEN Tao, AN Zhongwei*   

  1. Xi'an Modern Chemistry Research Institute,Xi'an 710065,China
  • Received:2014-06-11 Accepted:2014-10-30 Published:2015-03-02 Online:2015-03-02
  • Contact: Zhongwei AN
  • Supported by:
    Supported by the Defense Industrial Technology Development Program of China(No.B0520132007)

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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。

 

关键词: 含氟液晶, 丁烯基, 合成, 性能

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, Wittig-Horner, 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.

Key words: fluorinated liquid crystal, butenyl group, synthesis, property

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