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US 5,512,207 AGranted
Azaaromatic compounds, process for their preparation, and their use in liquid-crystalline mixtures
AssigneeHoechst Aktiengesellschaft
InventorsJavier Manero, Hubert Schlosser, Rainer Wingen
Life of this patent
Estimating the term…
Abstract
Azaaromatic compounds of the formula I ##STR1## in which R.sup.1 and R.sup.2 are, for example, alkyl radicals, M is, for example, --O--, --COO-- or --O--CO--O--, A is an aromatic or heteroaromatic ring, V, X, Y and Z are CH, CF or N, a,b,c,d,m and n are 0 or 1, where m+n is 0 or 1 and a+d is 0 or 1. The compounds of the formula I are suitable as components of liquid-crystal mixtures.
Claims5
A ferroelectric liquid-crystalline mixture comprising at least one compound of the formula (I)
- R.sup.1 (--A.sup.1).sub.a (--M.sup.1).sub.b --U--(--M.sup.2).sub.c (--A.sup.2).sub.d --R.sup.2
- in which the symbols and indices have the following meanings:
- --U--
- is selected from the group consisting of ##STR82## R.sup.1 and R.sup.2 are, independently of one another, a straight-chain or branched alkyl radical having 1 to 20 carbon atoms (with or without asymmetrical carbon atoms), it also being possible for one or more CH.sub.2 groups to be replaced by --O--, --CO--, ##STR83## --Si(CH.sub.3).sub.2 --, or 1,4-phenylene, with the proviso that oxygen atoms must not be bonded directly to one another,
- or one of the following chiral groups:
- ##STR84## R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 are, independently of one another, hydrogen or a straight-chain or branched alkyl radical having 1-16 carbon atoms (with or without asymmetrical carbon atoms), it also being possible for one or more CH.sub.2 groups to be replaced by --O--, with the proviso that oxygen atoms must not be bonded directly to one another, R.sup.4 and R.sup.5 together may also be --(CH.sub.2).sub.4 -- or --(CH.sub.2).sub.5 -- if they are bonded to an oxirane or dioxolane;
- M.sup.1 and M.sup.2 are, independently of one another, --O--, --CO--O--, --O--CO--, --CH.sub.2 --O-- or --O--CH.sub.2 --;
- a and d are zero;
- and
- b and c are zero or one;
- m and n are zero or one.
8 more elements
An azaaromatic compound of the general formula I
- R.sup.1 (--A.sup.1).sub.a (--M.sup.1).sub.b --U--(--M.sup.2).sub.c (--A.sup.2).sub.d --R.sup.2
- in which the symbols and indices have the following meanings:
- --U--
- is selected from the group consisting of:
- ##STR85## R.sup.1 and R.sup.2 are, independently of one another, a straight-chain or branched alkyl radical having 1 to 20 carbon atoms (with or without asymmetrical carbon atoms), it also being possible for one or more CH.sub.2 groups to be replaced by --O--, --CO--, ##STR86## --Si(CH.sub.3).sub.2 -- or 1,4-phenylene, with the proviso that oxygen atoms must not be bonded directly to one another,
- or one of the following chiral groups:
- ##STR87## R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 are, independently of one another, hydrogen or a straight-chain or branched alkyl radical having 1-16 carbon atoms (with or without asymmetrical carbon atoms), it also being possible for one or more CH.sub.2 groups to be replaced by --O--, with the proviso that oxygen atoms must not be bonded directly to one another, R.sup.4 and R.sup.5 together may also be --(CH.sub.2).sub.4 -- or --(CH.sub.2).sub.5 -- if they are bonded to an oxirane or dioxolane;
- M.sup.1 and M.sup.2 are, independently of one another, --O--, --CO--O--, --O--CO--, --CH.sub.2 --O-- or --O--CH.sub.2 --;
- a and d are zero;
- and
- b and c are zero or one.
8 more elements
Dependencies are inferred from the claim text.