Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (3): 255-260.DOI: 10.11944/j.issn.1000-0518.2015.03.140207

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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)


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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