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Citation: LI Jian, HU Minggang, LI Juanli, YANG Zhi, YANG Xiaozhe, CHE Zhaoyi, CHEN Tao, AN Zhongwei. New Synthetic Method and Properties of the 3-Butenyl-Based Fluorinated Biphenyl Liquid Crystals[J]. Chinese Journal of Applied Chemistry, ;2015, 32(3): 255-260. doi: 10.11944/j.issn.1000-0518.2015.03.140207 shu

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

1.
Xi'an Modern Chemistry Research Institute, Xi'an 710065, China

Corresponding author: AN Zhongwei,
Received Date: 11 June 2014
Available Online: 30 October 2014
Fund Project: 国防基础科研基金资助项目(B0520132007) (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,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.
- fluorinated liquid crystal,
- butenyl group,
- synthesis,
- property
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