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    • 57. 发明授权
    • Liquid crystal dielectric
    • 液晶电介质
    • US4818431A
    • 1989-04-04
    • US933953
    • 1986-11-24
    • Rudolf EidenschinkJoachim KrausePeter Fuss
    • Rudolf EidenschinkJoachim KrausePeter Fuss
    • C07D309/04C07D309/06C07D309/10C07D309/30C07D407/04C09K19/34C09K19/46G02F1/13C07D309/08C07D405/06C07D407/02
    • C07D407/04C07D309/04C07D309/06C07D309/30C09K19/3402C09K19/3441C09K19/3472C09K2019/3422
    • New tetrahydropyran derivatives of the formula I ##STR1## in which G is H.sub.2 or .dbd.O, R.sup.1 and R.sup.2 are each an alkyl group having 1-10 C atoms, it also being possible for one or two CH.sub.2 groups to be replaced by O atoms, or are F, Cl, Br or CN, R.sup.2 is also H, A.sup.1 and A.sup.2 are each 1,4-phenylene, 1,4-cyclohexylene, 1,3-dioxane-2,5-diyl, piperidine-1,4-diyl, 1,4-bicyclo[2.2.2]octylene or pyrimidine-2,5-diyl groups which are unsubstituted or substituted by 1-4 F atoms, Z.sup.1 and Z.sup.2 are each --CO--O--, --O--CO--, --CH.sub.2 CH.sub.2 --, --OCH.sub.2 --, --CH.sub.2 O--, or a single bond, m and n are each 0, 1, 2 or 3, but (m+n) is at least 1 and at most 3, it being possible, when m is 2 or 3, for the group A.sup.1 and, when n is 2 or 3, for the groups A.sup.2 each to be identical or different from one another, and the acid addition salts of those among these compounds which are basic, are suitable for use as components in liquid-crystal dielectrics.
    • 其中G为H 2或= O,R 1和R 2的式I的新的四氢吡喃衍生物各自为具有1-10个C原子的烷基,也可以将一个或两个CH 2基团替换为O 或者是F,Cl,Br或CN,R2也是H,A1和A2分别是1,4-亚苯基,1,4-亚环己基,1,3-二恶烷-2,5-二基,哌啶-1, 未被取代或被1-4个F原子取代的4-二基,1,4-二环[2.2.2]辛烯或嘧啶-2,5-二基,Z 1和Z 2各自为-CO-O-,-O- CO-,-CH 2 CH 2 - , - OCH 2 - , - CH 2 O-或单键,m和n各自为0,1,2或3,但(m + n)为至少1且最多为3, 当m为2或3时,对于基团A1,当n为2或3时,对于各自彼此相同或不同的基团A2,并且这些化合物中的碱加成盐, 适用于液晶电介质中的组分。