申请人:Merck Patent Gesellschaft mit beschrankter Haftung
公开号:US04627933A1
公开(公告)日:1986-12-09
Compounds of the formula R.sup.1 --Q.sup.1 --(CH.sub.2).sub.m --(COO).sub.n --(CH.sub.2).sub.p --Q.sup.2 --R.sup.2 wherein R.sup.1 and R.sup.2 are each independently alkyl or alkoxy each of 1-12 C atoms, F, Cl, Br, CN or --Q.sup.3 --R.sup.3, or one of R.sup.1 and R.sup.2 can also be H; Q.sup.1, Q.sup.2 and Q.sup.3 are each independently 1,4-phenylene, 1,4-cyclohexylene, 1,4-bicyclo(2,2,2)-octylene or 1,3-dioxane-2,5-diyl, each of which is unsubstituted or substituted by 1-4 fluorine, chlorine or bromine atoms; R.sup.3 is alkyl or alkoxy each of 1-8 C atoms, H, F, Cl, Br or CN; m is 1, 2, 3, 4, 5 or 6; n is 0 or 1; and p is 0, 1, 2, 3, 4 or 5; the sum of (m+p) being 2, 4 or 6 and the sum of (m+n+p) being at least 3; but with the proviso that Q.sup.3 is unsubstituted 1,4-phenylene or 1,4-phenylene substituted by a fluorine, chlorine or bromine atom, only when n=1 or (m+p)=6 or at least one of R.sup.1 or R.sup.3 is F, Cl or Br or none of R.sup.1 to R.sup.3 is CN or two of the radicals R.sup.1 to R.sup.3 are CN, are valuable liquid crystalline components.
式为R.sup.1 --Q.sup.1 --(CH.sub.2).sub.m --(COO).sub.n --(CH.sub.2).sub.p --Q.sup.2 --R.sup.2的化合物,其中R.sup.1和R.sup.2分别独立地为1-12个碳原子的烷基或烷氧基,F,Cl,Br,CN或--Q.sup.3 --R.sup.3,或者R.sup.1和R.sup.2中的一个也可以是H;Q.sup.1,Q.sup.2和Q.sup.3分别独立地为1,4-苯撑基,1,4-环己撑基,1,4-双环(2,2,2)-辛撑基或1,3-二氧杂环戊二烷基,每个基未取代或取代为1-4个氟,氯或溴原子;R.sup.3为1-8个碳原子的烷基或烷氧基,H,F,Cl,Br或CN;m为1, 2, 3, 4, 5或6;n为0或1;p为0, 1, 2, 3, 4或5;(m+p)之和为2, 4或6,(m+n+p)之和至少为3;但条件是当n=1或(m+p)=6或R.sup.1或R.sup.3中至少有一个为F,Cl或Br,或R.sup.1到R.sup.3中没有一个为CN,或R.sup.1到R.sup.3中有两个基为CN时,Q.sup.3为未取代的1,4-苯撑基或1,4-苯撑基取代为氟,氯或溴原子时,这些化合物是有价值的液晶组分。