Cyclobutane benzene derivatives
AssigneeMerck Patent GmbH
InventorsEike Poetsch, Werner Binder, Volker Meyer, Ulrich Finkenzeller, Bernhard Rieger
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Abstract
The invention relates to methylenecyclobutane benzene derivatives of the formula I ##STR1## in which R.sup.1, A.sup.1, Z.sup.1, L.sup.1, L.sup.2, m, V, W, Y and n have the meaning given in claim 1, and to their use as components of liquid-crystalline media for electrooptical displays.
Claims12
A cyclobutane benzene compound of formula I ##STR24## in which R.sup.1 is alkyl or alkenyl having 1 to 16 carbon atoms, in which additionally one or more CH.sub.2 groups may be replaced by --O--, or is a group of the formula ##STR25## in which R.sup.2 is alkyl or alkenyl having 1 to 16 carbon atoms, ##STR26## o is 0 or 1, V and W are each CH.sub.2 or CH.sub.2 CH.sub.2, and when V is CH.sub.2 CH.sub.2 m is 1, 2 or 3 and W is CH.sub.2,
- A.sup.1 is each independently 1,4-phenylene which is unsubstituted or substituted by 1 to 2 fluorine atoms, in which, in addition, one or two CH groups may be replaced by N, or is 1,4-cyclohexylene which is unsubstituted or substituted by a cyano group, and in which, in addition, one or two CH.sub.2 groups may be replaced by O or S, or is thiadiazole-2,5-diyl, 1,4-bicyclo[2.2.2]octylene, or a radical of the formula ##STR27## in which r and s are each 0, 1, 2 or 3, L.sup.1 and L.sup.2 are each F,
- Z.sup.1 is --CO--O, --O--CO--, --CH.sub.2 O--, --OCH.sub.2 --, --CH.sub.2 CH.sub.2 --, --C.ident.C-- or a single bond,
- Y is NCS, halogen or an alkyl, alkoxy, alkenyl or alkenyloxy group having 1 to 8 carbon atoms which is substituted by at least one fluorine and/or chlorine atom, and, if m=1, 2 or 3, is CN, or alkyl or alkenyl having up to 16 carbon atoms, in which, in addition, 1 or more CH.sub.2 groups may be replaced by --O--,
- m is 0, 1, 2 or 3, and
- n is 0, 1 or 2.
A spiro heptane benzene compound of formula I' ##STR32## wherein R.sup.1 is alkyl or alkenyl having 1 to 16 carbon atoms, in which additionally one or more CH.sub.2 groups may be replaced by --O--, or is a group of the formula ##STR33## in which R.sup.2 is alkyl or alkenyl having 1 to 16 carbon atoms, ##STR34## o is 0 or 1;
- Y is NCS, halogen or an alkyl, alkoxy, alkenyl or alkenyloxy group having 1 to 8 carbon atoms which is substituted by at least one fluorine and/or chlorine atom, CN, or alkyl or alkenyl having up to 16 carbon atoms, in which one or more CH.sub.2 groups are optionally replaced by O;
- and
- L.sup.1 is H or F.
Dependencies are inferred from the claim text.