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US 5,308,542 AGranted
4,4'-disubstituted 2',3-difluorobisphenyls and a liquid-crystalline medium
AssigneeMerck Patent GmbH
InventorsEike Poetsch, Volker Reiffenrath, Reinhard Hittich, Bernhard Rieger
Life of this patent
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Abstract
The invention relates to 4,4'-disubstituted 2',3-difluorobiphenyls of the formula I ##STR1## in which n is 1 to 7, A is trans-1,4-cyclohexylene or 1,4-phenylene, r is 0 or 1, X is F, Cl, --CF.sub.3, --CHF.sub.2, --OCF.sub.3 or --OCHF.sub.2 and Z is H or F.
Claims10
A 4,4'-disubstituted 2', 3-difluorobiphenyl of formula Ia ##STR11## wherein ##STR12## is trans-1,4-cyclohexylene or 1,4-phenylene, n is 1-7,
- r is 0, and
- X is F, Cl or --CF.sub.3.
Dependencies are inferred from the claim text.