2-正戊丙烷-1,3-二醇 、 3,4-二氟苯甲醛 、 对甲苯磺酸 以
二氯甲烷 、 氯仿 、 苯 、 甲苯 为溶剂,
以to yield mixtures of the cis and trans isomers of 5-pentyl-2-(3',4'-difluorophenyl)-1,3-dioxane的产率得到5-pentyl-2-(3',4'-difluorophenyl)-1,3-dioxane
参考文献:
名称:
1,3-dioxane derivatives and composition including same
1,3-dioxane derivatives and composition including same
申请人:Seiko Epson Corporation
公开号:US05026879A1
公开(公告)日:1991-06-25
2-(3', 4'-difluorophenyl)-1,3-dioxane derivatives represented by the general formula: ##STR1## wherein R is a linear alkyl group having from 1 to 8 atoms, and having large positive dielectric constant anisotropy (.DELTA..epsilon.) and small refractive index anisotropy (.DELTA.n). The dioxane derivatives may be included in liquid crystal compositions for improved display devices having a low threshold voltage, a low driving voltage and a wide visual angle.