Patent number: 5494606
Abstract: Novel 1,3-dioxane derivatives of the formula I ##STR1## in which Q is CHalogen.sub.1 H.sub.3-1, CnH.sub.2n+1 --O-- or C.sub.2 H.sub.2n+1 --CH.dbd.CH--, whereHalogen is F or Cl,l is 1, 2 or 3 andn is 0 to 5,r is 0 to 5,X=X'=0 and Y=Y'=CH.sub.2 orX=X'=CH.sub.2 and Y=Y'=O,Z.sup.1 and Z.sup.2 are each, independently of one another, --C.sub.2 H.sub.4 -- or a single bond,A.sup.1 is trans-1,4-cyclohexylene, 1,4-phenylene, 3-fluoro-1,4-phenylene or 3,5-difluoro-1,4-phenylene,m is 0, 1 or 2,X is F, Cl, --CF.sub.3, ---CN, --OCF.sub.3 or --OCHF.sub.2 andY and Z are each, independently of one another, H or F, can be used as components of liquid-crystalline media.
Type:
Grant
Filed:
May 26, 1993
Date of Patent:
February 27, 1996
Assignee:
Merck Patent Gesellscaft mit beschrankter Haftung
Inventors:
Volker Reiffenrath, Joachim Krause, Reinhard Hittich, Eike Poetsch, Herbert Plach
Patent number: 5458806
Abstract: Fluoromethyl ketones of the formula I ##STR1## are suitable as components of liquid-crystalline media wherein R is H, a substituted or unsubstituted alkyl or alkenyl radical having 1 to 15 carbon atoms,A.sup.1 and A.sup.2 are each, independently of one another, a(a) trans-1,4-cyclohexylene radicals and derivatives thereof in which, in addition, one or more non-adjacent CH.sub.2 groups is optionally replaced by --O-- and/or --S--,(b) 1,4-phenylene radicals and derivatives thereof in which, in addition, one or two CH groups is optionally replaced by N, or(c) radical from the group consisting of 1,4-cyclohexenylene, 1,4-bicyclo(2,2,2)octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1,2,3,4-tetrahydronaphthalene-2,6-diyl,wherein radicals (a) and (b) are optionally substituted by one or two fluorine atoms,Z.sup.1 and Z.sup.2 are each, independently of one another, --CO--O--, --O--CO--, --CH.sub.2 O--, --OCH.sub.2 --, --CH.sub.2 CH.sub.2 --, --CH.dbd.CH--, --C.tbd.
Type:
Grant
Filed:
May 4, 1994
Date of Patent:
October 17, 1995
Assignee:
Merck Patent Gesellschaft mit beschrankter Haftung
Inventors:
Ekkehard Bartmann, Herbert Plach
Patent number: 5458805
Abstract: Novel phenylcyclohexanes of the formula I ##STR1## in which n is 0 to 7, Q.sup.1 and Q.sup.2 are H, or one of these radicals is alternatively CH.sub.3, r is 0, 1, 2, 3, 4 or 5, A is trans-1,4-cyclohexylene, 1,4-phenylene, 3-fluoro-1,4-phenylene or a single bond, X is F, Cl, --CF.sub.3, --CN, --OCF.sub.3 or --OCHF.sub.2, and Y and Z are each, independently of one another, H or F, with the proviso that, in the case where A is a single bond, Q.sup.1 =Q.sup.2 =H and simultaneously X=CN, Y and/or Z are F.
Type:
Grant
Filed:
April 15, 1993
Date of Patent:
October 17, 1995
Assignee:
Merck Patent Gesellschaft mit beschrankter Haftung
Inventors:
Andreas Wachtler, Reinhard Hittich, Eike Poetsch, Herbert Plach, David Coates, Bernhard Rieger, Joachim Krause