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US4776973A Pyrimidine derivatives 失效
嘧啶衍生物

Pyrimidine derivatives
摘要:
Pyrimidine derivatives of the formula IR.sup.1 --Pry--A.sup.1 --Z.sup.1 --A.sup.2 -[Z.sup.2 --A.sup.3 ].sub.m --R.sup.2 Iin whichR.sup.1 and R.sup.2 each are an alkyl group having 1 to 12 C atoms, in which one or two non-adjacent CH.sub.2 groups can also be replaced by --O--, --CO--, --O--CO--, --CO--O-- or --CH.dbd.CH--, and one of the radicals R.sup.1 and R.sup.2 are H, F, Cl, Br or CN,Pyr is pyrimidine-2,5-diyl,A.sup.1 and A.sup.3 each are 1,4-cyclohexylene, unsubstituted 1,4-phenylene or 1,4-phenylene which is substituted by one or two F and/or Cl atoms and/or CH.sub.3 and /or CN groups,A.sup.2 is 1,4-phenylene which is unsubstituted or substituted by one or two F and/or Cl atoms and/or CH.sub.3 and/or CN groups,Z.sup.1 is --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, or --OCH.sub.2 --Z.sup.2 is --CO--O--, --O--CO--, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, --O--CH.sub.2 -- or a single bond, andm is 0 or 1,are suitable for preparing liquid crystal phases having steep electro-optical characteristic curves.
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