Chinese Journal of Liquid Crystals and Displays, Volume. 34, Issue 12, 1143(2019)
Polyhalogenated biphenyl compound and its liquid crystal monomer
A new polyhalogenated biphenyl compound 4-bromo-4′-(bromodifluoromethyl)-2,3,3′,5′-tetrafluoro-1,1′-biphenyl was synthesized from 2,3,3′,5′-tetrafluoro-1,1′-biphenyl by reacting with n-BuLi and CF2Br2 under ultra-low temperature. But, this reaction can be simplified to a one-step reaction by constructing two different functional groups -CF2Br and -Br into the molecular structure. As a general intermediate, this compound can be used to synthesize a variety of difluoromethyl ether bridge-bonded liquid crystal monomers, which provides a new method for the preparation of such liquid crystal monomers. In this paper, the difluoromethyl ether bridge-bonded liquid crystal monomer 3PYUQUF was synthesized by the above methods. The results show that the Δn values of the compound 3PYUQUF was 0.138 0, and the Δε value was 22.63.
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YANG Xue-jun, ZHANG Wang-cai, ZHANG Yan-wei, DU Wei-song, GAO Ai-ai, BIE Guo-jun. Polyhalogenated biphenyl compound and its liquid crystal monomer[J]. Chinese Journal of Liquid Crystals and Displays, 2019, 34(12): 1143
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Received: Aug. 19, 2019
Accepted: --
Published Online: Jan. 9, 2020
The Author Email: YANG Xue-jun (yxj_19840@163.com)