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AssigneeChisso Corporation
InventorsHiromichi Inoue, Takashi Inukai, Kouji Ohno, Kazutoshi Miyazawa, Shinichi Saito
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A ferroelectric pyridine compound suitable as a liquid crystal for display mode utilizing ferroelectric properties and exhibiting SC* phase at a temperature somewhat higher than room temperature and a liquid crystal composition are provided, which compound is expressed by the formula ##STR1## wherein n represents an integer of 0 to 8, R.sub.1 represents an alkyl group of 2 to 18 carbon atoms, R.sub.2 represents an alkyl group of 1 to 18 carbon atoms and the symbol * indicates that C having the symbol attached thereon is an optically active carbon atom.
A ferroelectric pyridine compound expressed by the formula ##STR10## wherein n represents an integer of 1 to 8, R.sub.1 represents an alkyl group of 2 to 18 carbon atoms, R.sub.2 represents an alkyl group of 1 to 18 carbon atoms and the symbol * indicates that C having the symbol attached thereon is an optically active carbon atom.
Dependencies are inferred from the claim text.
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Radicals substituted by singly-bound oxygen or sulphur atoms: oxygen atoms
Having nitrogen as hetero atom: the heterocyclic ring being a six-membered aromatic ring containing one nitrogen atom, e.g. pyridine
Heterocyclic compounds
Materials for miscellaneous applications, not provided for elsewhere
Term ended 16 Dec 2006 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
This invention relates to a novel liquid crystal substance and a liquid crystal composition containing the liquid crystal substance, and more particularly it relates to a chiral liquid crystal substance having an optically active group and a chiral liquid crystal composition containing the same.
2. Description of the Related Art
The ferroelectric pyridine compounds of the present invention will be described in more detail by way of Examples.
Preparation of optically active 2-[p-(5-methylheptyloxy)phenyl]-5-heptylpyridine (a compound of the formula (I) wherein R.sub.1 .dbd.C.sub.2 H.sub.5, R.sub.2 .dbd.C.sub.7 H.sub.15 and n=4) (sample No. 4)
N-heptenylpiperidine (41.8 g, 0.20 mol) and triethylamine (20 g, 0.20 mol) were dissolved in ethyl ether (100 ml) with stirring, followed by dropwise adding to the resulting solution, a solution of the above compound (II) (30 g, 0.20 mol) prepared in advance according to a known method, dissolved in ethyl ether (200 ml) while keeping the temperature of the system at 35.degree. C. or lower, agitating the resulting mixture at room temperature for 8 hours, adding water (100 ml) and toluene (50 ml), transferring the mixture into a separatory funnel, twice washing the resulting organic layer with water, distilling off the solvent under reduced pressure, adding 70% perchloric acid (100 ml) to the residue, adding water (100 ml), heating the mixture under reflux for 10 minutes, cooling the resulting material, washing the resulting crystals with ethyl ether and drying the crystals to obtain 5-heptyl-2-(p-methoxyphenylpyrilium) perchlorate (compound (III), R.dbd.C.sub.7 H.sub.15) (48.0 g).