申请人:Hoechst Aktiengesellschaft
公开号:US05562859A1
公开(公告)日:1996-10-08
2-Fluoropyrazines, process for their preparation, and their use in liquid-crystalline mixtures A 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 or M.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.
2-氟吡嗪的制备方法及其在液晶混合物中的应用
具有公式(I)的2-氟吡嗪
其中符号具有以下含义:R1和R2,彼此独立,例如,是H或直链或支链烷基,A1,A2,A3和A4相同或不同,例如,是1,4-苯基或M1,M2,M3和M4相同或不同,例如,是--O--或--CO--O--,R3,R4,R6和R7,彼此独立,例如,是H或直链或支链烷基,M5例如是--O--CO--或单一键,k,l,m,n,o,p,q和r是零或一,条件是k+m+p+r之和小於4且大於零,可用作液晶混合物的组分。