申请人:Merck Patent Gesellschaft mit beschrankter Haftung
公开号:US04818431A1
公开(公告)日:1989-04-04
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.
公式I的新四氢吡喃衍生物,其中G为H.sub.2或.dbd.O,R.sup.1和R.sup.2均为具有1-10个C原子的烷基,也可以用O原子替换其中一个或两个CH.sub.2基团,或为F、Cl、Br或CN,R.sup.2也可以为H,A.sup.1和A.sup.2均为1,4-苯撑基、1,4-环己撑基、1,3-二氧杂环戊烷-2,5-二基基、哌啶-1,4-二基基、1,4-双环[2.2.2]辛撑基或嘧啶-2,5-二基基,这些基团可以是未取代的或取代的,取代基为1-4个F原子,Z.sup.1和Z.sup.2均为--CO--O--、--O--CO--、--CH.sub.2 CH.sub.2 --、--OCH.sub.2 --、--CH.sub.2 O--或单键,m和n均为0、1、2或3,但(m+n)至少为1且最多为3,当m为2或3时,A.sup.1,当n为2或3时,A.sup.2可以相同或不同,这些化合物中碱性的酸加成盐适用于作为液晶介质中的组分。