Difluorophenyl pyrimidyl pyridine derivatives and the use thereof in liquid crystal mixtures
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Feb 8, 2000
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N/A
app pub date -
Jan 14, 1999
filing date -
Dec 28, 1995
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Expired
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Abstract
Difluorophenylpyrimidylpyridine derivatives of the formula (I) ##STR1## wherein X is N and Y is CH or X is CH and Y is N; R.sup.1 and R.sup.2 are identical or different and are a) an unbranched or branched alkyl chain having 1 to 20 carbon atoms, where aa) one or more non-adjacent and non-terminal CH.sub.2 groups may be replaced by --O--, --CO--O--, --O--CO--, --O--CO--O-- or --Si(CH.sub.3).sub.2 --, and/or ab) one or more H atoms may be replaced by F, and/or ac) the terminal CH.sub.3 group may be replaced by one of the following chiral groups (optically active or racemic): ##STR2## R.sup.3, R.sup.4 and R.sup.5 are identical or different and are hydrogen or a straight-chain or branched alkyl radical having 1-16 carbon atoms (with or without an asymmetrical carbon atom), where, in addition, one or more non-adjacent non-terminal CH.sub.2 groups may be replaced by --O--, and/or where one or more H atoms of the alkyl radical may be substituted by --F; R.sup.4 and R.sup.5 may alternatively together be --(CH.sub.2).sub.4 -- or --(CH.sub.2).sub.5 -- if they are bonded to a dioxolane system, are suitable as components, in particular, of ferroelectric liquid-crystal mixtures.
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