申请人:Hoechst Aktiengesellschaft
公开号:US05445763A1
公开(公告)日:1995-08-29
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.
式(I)中的3-氟吡啶,其中符号具有以下含义:R.sup.1和R.sup.2,独立地,例如为H或直链或支链烷基,A.sup.1、A.sup.2、A.sup.3和A.sup.4相同或不同,例如为1,4-苯撑基,吡嗪-2,5-二基或反-1,4-环己基,M.sup.1、M.sup.2、M.sup.3和M.sup.4相同或不同,例如为--O--或--CO--O--,R.sup.3、R.sup.4、R.sup.6和R.sup.7独立地为H或直链或支链烷基,M.sup.5例如为--O--CO--或单键,k、l、m、n、o、p、q和r为零或一,但须满足k+m+p+r的和小于4且大于零,可优选地用作铁电液晶混合物中的组分。