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    • 23. 发明授权
    • Halogenated diphenyldiacetylene liquid crystals
    • 卤化二苯基二乙炔液晶
    • US5178791A
    • 1993-01-12
    • US667668
    • 1991-03-11
    • Michael D. WandSean D. Monahan
    • Michael D. WandSean D. Monahan
    • C07C43/225C09K19/18
    • C07C43/225C09K19/18
    • The present invention provides liquid crystals that are 3,3'-dihalogenated diphenyldiacetylenes of the general formula: ##STR1## where X and Y are, independently of one another, a halogen atom and T.sub.1 and T.sub.2, independently of one another are alkyl or alkenyl or alkoxy tail groups, R.sub.1, R.sub.2, or OR.sub.3, respectively, wherein R.sub.1 and R.sub.3, independently of one another, are straight-chain or branched alkyl groups having three to twenty carbon atoms and R.sub.2 is a mono or diene which may be branched or straight-chain having three to twenty carbon atoms. R.sub.1, R.sub.2, or R.sub.3 may be substituted with one or more halogens, particularly fluorines, except that the C-1 carbon of an OR.sub.3 tail may not be halogenated. One or two non-neighboring CH.sub.2 groups of R.sub.1 or R.sub.3 may be substituted with an O atom, except that the C-1 CH.sub.2 group of an OR.sub.3 tail may not be substituted with an O atom. Liquid crystals in which X=Y=fluorine and T.sub.1 =T.sub.2 are more preferred. Compounds in which R.sub.1, R.sub.2 and R.sub.3 are straight-chain alkyl groups or .omega.-monoene groups are more preferred.
    • 本发明提供了具有以下通式的3,3'-二卤代二苯基二乙炔的液晶:其中X和Y彼此独立地为卤素原子,且T1和T2彼此独立地为烷基或 烯基或烷氧基尾基,R1,R2或OR3,其中R1和R3彼此独立地是具有3-20个碳原子的直链或支链烷基,R2是可以是支链的单或二烯 或具有3-20个碳原子的直链。 R1,R2或R3可以被一个或多个卤素,特别是氟取代,除了OR3尾部的C-1碳不能被卤化。 R 1或R 3的一个或两个不相邻的CH 2基团可以被O原子取代,除了OR 3尾部的C-1 CH 2基团可以不被O原子取代。 更优选X = Y =氟且T1 = T2的液晶。 R1,R2和R3是直链烷基或ω-单烯基的化合物是更优选的。