会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 5. 发明授权
    • Liquid crystalline esters
    • 液晶酯
    • US5082589A
    • 1992-01-21
    • US485710
    • 1990-02-27
    • Richard BucheckerHans-Jurgen FrommStephen KellyMartin Schadt
    • Richard BucheckerHans-Jurgen FrommStephen KellyMartin Schadt
    • C07C69/773C09K19/30
    • C07C255/00C09K19/3068
    • Compounds of the formula ##STR1## wherein m represents is the number of 0 to 1; A is a single convalent bond, --CH.sub.2 --CH.sub.2 --, --OCH.sub.2 --, --COO-- or --OOC--; rings B, C and D are 1,4-phenylene optionally substituted with cyano, halogen or lower alkyl; Y.sup.1 and Y.sup.2 are hydrogen or one of them also is cyano; and R.sup.1 and R.sup.2 each represents C.sub.1 -C.sub.18 -alkyl or C.sub.2 -C.sub.18 alkenyl, either of which is optionally halogen-substituted, in which one CH.sub.2 group or two non-adjacent CH.sub.2 groups is/are optionally replaced by oxygen: with the provisos that at least one of R.sup.1 and R.sup.2 has a chiral carbon atom or R.sup.1 is straight-chain C.sub.4-18 -alkoxy and R.sup.2 is straight C.sub.3-18 -alkyl or a C--C double bond or both when A is --COO-- and at least one of R.sup.1 and R.sup.2 has a C--C double bond when A is a single covalent bond, their preparation, liquid crystalline mixtures containing these compounds and their use for electro-optical purposes are described.
    • 式(Ⅰ)化合物其中m表示0至1的数; A是单个共价键,-CH 2 -CH 2 - , - OCH 2 - , - COO-或-OOC-; 环B,C和D是任选被氰基,卤素或低级烷基取代的1,4-亚苯基; Y1和Y2是氢或其中之一也是氰基; 并且R 1和R 2各自表示任选被卤素取代的C 1 -C 18 - 烷基或C 2 -C 18烯基,其中一个CH 2基团或两个不相邻的CH 2基团任选被氧取代:条件是 R 1和R 2中的至少一个具有手性碳原子,或者R 1是直链C 4-18 - 烷氧基,并且R 2是直链C 3-8 - 烷基或CC双键,或者当A是-COO-时, 当A是单一共价键时,R1和R2具有CC双键,其制备,含有这些化合物的液晶混合物及其用于电光目的的用途。