2-fluoropyrazines process for their preparation, and their use in
liquid-crystalline mixtures
    2.
    发明授权
    2-fluoropyrazines process for their preparation, and their use in liquid-crystalline mixtures 失效
    2-氟吡嗪的制备方法及其在液晶混合物中的应用

    公开(公告)号:US5562859A

    公开(公告)日:1996-10-08

    申请号:US457747

    申请日:1995-06-01

    摘要: 2-Fluoropyrazines, process for their preparation, and their use in liquid-crystalline mixturesA 2-fluoropyrazine of the formula (I) ##STR1## in which the symbols have the following meanings: R.sup.1 and R.sup.2, independently of one another, are, for example, H or straight-chain or branched alkyl,A.sup.1, A.sup.2, A.sup.3 and A.sup.4 are identical or different and are, for example, 1,4-phenylene orM.sup.1, M.sup.2, M.sup.3 and M.sup.4 are identical or different and are, for example, --0-- or --CO--O--,R.sup.3, R.sup.4, R.sup.6 and R.sup.7, independently of one another, are, for example, H or straight-chain or branched alkyl,M.sup.5 is, for example, --O--CO-- or a single bond,k, l, m, n, o, p, q and r are zero or one, with the condition that the sum of k+m+p+r is less than 4 and greater than zero,can advantageously be employed as a component in liquid-crystal mixtures.

    摘要翻译: 2-氟吡嗪,它们的制备方法及其在液晶混合物中的用途式(I)的2-氟吡嗪类似于以下含义:R 1和R 2彼此独立地是,例如, H或直链或支链烷基,A1,A2,A3和A4相同或不同,例如为1,4-亚苯基或M1,M2,M3和M4相同或不同,为 - 0-或-CO-O-,R3,R4,R6和R7彼此独立地为例如H或直链或支链烷基,M5为例如-O-CO-或单 键,k,l,m,n,o,p,q和r分别为0或1,条件是k + m + p + r的和小于4且大于零, 液晶混合物中的成分。

    3-fluoropyridines, process for their preparation, and their use in
liquid-crystal mixtures
    7.
    发明授权
    3-fluoropyridines, process for their preparation, and their use in liquid-crystal mixtures 失效
    3-氟吡啶,其制备方法及其在液晶混合物中的应用

    公开(公告)号:US5445763A

    公开(公告)日:1995-08-29

    申请号:US72929

    申请日:1993-06-07

    摘要: A 3-fluoropyridine of the formula (I) ##STR1## in which the symbols have the following meanings: R.sup.1 and R.sup.2, independently of one another, are, for example, H or straight-chain or branched alkyl, A.sup.1, A.sup.2, A.sup.3 and A.sup.4 are identical or different and are, for example, 1,4-phenylene, pyrazine-2,5-diyl or trans-1,4-cyclohexylene, M.sup.1, M.sup.2, M.sup.3 and M.sup.4 are identical or different and are, for example, --O-- or --CO--O--, R.sup.3, R.sup.4, R.sup.6 and R.sup.7, independently of one another are, for example, H or straight-chain or branched alkyl, M.sup.5 is for example, --O--CO-- or a single bond, k, l, m, n, o, p, q and r are zero or one, with the proviso that the sum k+m+p+r is less than 4 and greater than zero, can advantageously be employed as a component in ferroelectric liquid-crystal mixtures.

    摘要翻译: 式(I)所示的3-氟吡啶其中符号具有以下含义:R 1和R 2彼此独立地是例如H或直链或支链烷基 ,A1,A2,A3和A4相同或不同,例如为1,4-亚苯基,吡嗪-2,5-二基或反-1,4-亚环己基,M1,M2,M3和M4相同或相同 例如,-O-或-CO-O-,R 3,R 4,R 6和R 7彼此独立地为例如H或直链或支链烷基,M 5为例如-O -CO-或单键,k,l,m,n,o,p,q和r为零或一个,条件是和k + m + p + r小于4且大于零, 可以有利地用作铁电液晶混合物中的组分。