以含氟溴苯为原料,在N2保护下,经格氏反应,在-10℃条件下,生成含氟苯硼酸,然后以PdCl2为催化剂与对溴苯酚偶联,制得含氟联苯酚,通过与烷基苯甲酰氯的反应,制备了三环的含氟联苯酚酯类液晶,总收率大于30%,液相色谱测定其质量分数大于98%。目标化合物经IR、1H NMR、MS确认了分子结构。DSC分析表明,该类化合物有较高的清亮点(>209℃)和宽的介晶相温度范围(>98℃),用AM1方法,对其进行了几何结构优化,从微观结构讨论了其性质,结果表明,能与苯环共轭的含端位氰基的液晶材料的熔点和清亮点较高,这与实验结果一致。 Fluorobromobenzene as raw material, under the protection of N2, Grignard reaction at -10 ℃ under conditions to generate fluorobenzene boronic acid, and then PdCl2 as catalyst and bromophenol coupling to obtain fluorine biphenol, The tricyclic fluorinated biphenol ester liquid crystal was prepared by the reaction with alkylbenzoyl chloride, the total yield was more than 30% and the mass fraction was more than 98% by liquid chromatography. The target compounds were confirmed by IR, 1H NMR and MS. DSC analysis showed that these compounds have higher clearing point (> 209 ℃) and wide mesophase temperature range (> 98 ℃). The geometrical structures of these compounds have been optimized by AM1 method and their structures have been discussed from the microstructure The results show that the cyano group-containing liquid crystal materials that can be conjugated with benzene ring have higher melting point and clearing point, which is consistent with the experimental results.