Difluorobenzonitriles and liquid-crystalline medium
AssigneeMerck Patent GmbH
InventorsVolker Reiffenrath, Hans-Adolf Kurmeier, Bernhard Scheuble
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Abstract
Difluorobenzonitriles of the formula I ##STR1## in which Y is alkyl, alkenyl, alkoxy, oxaalkyl or alkenyloxy containing in each case 1 to 12 carbon atoms, one of the radicals A.sup.1 and A.sup.2 present in the molecule is ##STR2## where X is CH or N, and the other radical A.sup.1 or A.sup.2 is selected from the group comprising ##STR3## one of the radicals Z.sup.1 and Z.sup.2 is a single bond and the other radical Z.sup.1 or Z.sup.2 is --CH.sub.2 CH.sub.2 -- or a single bond, and m is 0 or 1, with the proviso that if m=1, Z.sup.1 =Z.sup.2 - single bond and one of the radicals A.sup.1 and A.sup.2 =2,5-pyrimidinediyl and the other radical A.sup.1 or A.sup.2 =1,4-phenylene, A.sup.1 is 2,5-pyrimidinediyl.
Claims14
A difluorobenzonitrile compound of formula I ##STR38## wherein Y is alkyl, alkenyl, alkoxy, oxaalkyl or alkenyloxy, in each case containing 1-12 carbon atoms;
- one of A.sup.1 and A.sup.2 which is present in the compound is ##STR39## and the other of A.sup.1 and A.sup.2 is ##STR40## x is CH or N;
- Z.sup.2 is a single bond;
- Z.sup.1 is --CH.sub.2 CH.sub.2 -- or a single bond;
- and
- m is 0 or 1,
- with the proviso that if m is 1, Z.sup.1 is a single bond, one of the radicals A.sup.1 and A.sup.2 is 2,5-pyrimidinediyl and the other of A.sup.1 and A.sup.2 is 1,4-phenylene, then A.sup.1 is 2,5-pyrimidinediyl and A.sup.2 is 1,4-phenylene;
- if m is 0, then A.sup.2 is ##STR41##
Dependencies are inferred from the claim text.