申请人:Hoffmann-La Roche Inc.
公开号:US04565425A1
公开(公告)日:1986-01-21
Compounds of the formula ##STR1## wherein R.sup.1 is hydrogen or straight-chain alkyl; R.sup.2 is --CN, --R, --COR, --COOR or when R.sup.2 is positioned on an aromatic ring R.sup.2 also can be --OR, --OOCR or --F; R is alkyl; A is a group with 1 to 4 six-membered rings, these rings being linked directly with one another and with ring B in each case via a single covalent bond or being linked at one or two positions also via --COO--, --OOC-- or --CH.sub.2 CH.sub.2 --; the six-membered rings in A and ring B each are 1,4-phenylene or trans-1,4-cyclohexylene or one of these rings also is trans-2,5-disubstituted m-dioxane, 2,5-disubstituted pyrimidine or 3,6-disubstituted pyridazine, with the proviso that a maximum of two adjacent trans-1,4-cyclohexylene rings are linked directly via a single covalent bond; and m is the integer 2, or when ring B is trans-1,4-cyclohexylene or trans-2,5-disubstituted m-dioxane, m also can be the integer 0, their manufacture, liquid crystalline mixtures which contain these compounds as well as the use of these compounds for electro-optical purposes are described. Additionally, compounds of the formula ##STR2## wherein R.sup.8 is straight-chain C.sub.1 -C.sub.12 alkyl, their manufacture, liquid crystalline mixtures which contain these compounds and their use for electro-optical purposes are described.
式##STR1##中的化合物,其中R.sup.1是氢或直链烷基;R.sup.2是--CN,--R,--COR,--COOR或当R.sup.2位于芳香环上时,R.sup.2也可以是--OR,--OOCR或--F;R是烷基;A是具有1至4个六元环的基团,这些环直接通过一个共价键彼此连接,并且在每种情况下与环B连接,也可以通过一个或两个位置连接,还可以通过--COO--,--OOC--或--CH.sub.2 CH.sub.2 --连接;A中的六元环和环B中的环每个都是1,4-苯撑基或反-1,4-环己撑基,或者其中一个环也是反-2,5-二取代的间二氧杂环己烷,2,5-二取代的嘧啶或3,6-二取代的吡啶嗪,但最多两个相邻的反-1,4-环己撑基环可以通过一个共价键直接连接;m是整数2,或者当环B是反-1,4-环己撑基或反-2,5-二取代的间二氧杂环己烷时,m也可以是整数0,描述了它们的制备、包含这些化合物的液晶混合物以及这些化合物用于电光目的。此外,描述了式##STR2##中的化合物,其中R.sup.8是直链C.sub.1-C.sub.12烷基,它们的制备、包含这些化合物的液晶混合物以及它们用于电光目的的用途。