申请人:Hoescht Research & Technology Deutchland GmbH & Co.
公开号:US06022492A1
公开(公告)日:2000-02-08
Difluorophenylpyrimidylpyridine derivatives of the formula (I) ##STR1## wherein X is N and Y is CH or X is CH and Y is N; R.sup.1 and R.sup.2 are identical or different and are a) an unbranched or branched alkyl chain having 1 to 20 carbon atoms, where aa) one or more non-adjacent and non-terminal CH.sub.2 groups may be replaced by --O--, --CO--O--, --O--CO--, --O--CO--O-- or --Si(CH.sub.3).sub.2 --, and/or ab) one or more H atoms may be replaced by F, and/or ac) the terminal CH.sub.3 group may be replaced by one of the following chiral groups (optically active or racemic): ##STR2## R.sup.3, R.sup.4 and R.sup.5 are identical or different and are hydrogen or a straight-chain or branched alkyl radical having 1-16 carbon atoms (with or without an asymmetrical carbon atom), where, in addition, one or more non-adjacent non-terminal CH.sub.2 groups may be replaced by --O--, and/or where one or more H atoms of the alkyl radical may be substituted by --F; R.sup.4 and R.sup.5 may alternatively together be --(CH.sub.2).sub.4 -- or --(CH.sub.2).sub.5 -- if they are bonded to a dioxolane system, are suitable as components, in particular, of ferroelectric liquid-crystal mixtures.
公式(I)的二氟苯基嘧啶基吡啶衍生物,其中X为N,Y为CH或X为CH,Y为N; R1和R2相同或不同,为a)具有1至20个碳原子的直链或支链烷基链,其中aa)一个或多个非相邻和非端CH2基团可以被替换为- O-,-CO-O-,-O-CO-,-O-CO-O-或-Si(CH3)2-,和/或ab)一个或多个H原子可以被F替换,和/或ac)端CH3基团可以被下列手性基团之一(光学活性或外消旋)替换:R3,R4和R5相同或不同,为氢或具有1-16个碳原子的直链或支链烷基基团(带或不带不对称碳原子),此外,一个或多个非相邻的非端CH2基团可以被替换为-O-,和/或烷基基团的一个或多个H原子可以被-F取代; 如果它们与二氧兰系统结合,则R4和R5也可以一起是-(CH2)4-或-(CH2)5-,特别适用于铁电液晶混合物的组分。