HAN Yao-hua, WANG kui, ZHANG Jian-li, LI Zhi-qiang, ZHANG Fang-miao. Synthesis and Properties of 3,5-Difluorotolane Liquid Crystal Compounds[J]. , 2013,28(5): 683-687
HAN Yao-hua, WANG kui, ZHANG Jian-li, LI Zhi-qiang, ZHANG Fang-miao. Synthesis and Properties of 3,5-Difluorotolane Liquid Crystal Compounds[J]. , 2013,28(5): 683-687 DOI: 10.3788/YJYXS20132805.0683.
5-difluorophenyl)-2-methylbut-3-yn-2-ol is prepared with 3
5-difluorobromobenzene and 2-methyl-3-butyn-2-ol by the catalyzed of Tetrakis(triphenylphosphine)palladium. 3
5-difluorophenylacetylene is synthesized with 4-(3
5-difluorophenyl)-2-methylbut-3-yn-2-ol and potassium hydroxide in paraffin oil. Six fluoro-phenytolene compounds of liquid crystal were prepared by the alkyation of 3
5-difluorotolanes intermediates which were synthesized by the sonogashira reaction.These compounds not only have large optical anisotropy(
n
)
but also have wider nematic phase temperature range by a series photoelectricity test and DSC analysis. These material can be used in TN