US5360576A
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US
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Chiral alkenylaryl 2,3-epoxyalkyl ethers, and the use thereof in liquid-crystalline mixtures
Assignee: Hoechst AG
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Filing: 1991-07-19
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Granted: 1994-11-01
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Expires: 2011-07-19
Abstract
Abstract Compounds of the formula (I) in which the symbols have the following meanings: R 1 is straight-chain or branched (C 3 -C 2 )alkenyl containing a terminal double bond, it being possible for one or two non-adjacent CH 2 groups to be replaced by O and/or S atoms, A and B, independently of one another, are phenyl, diazine-2,5-diyl or diazine-3,6-diyl, with the proviso that one of the groups A or B is phenyl and the other is diazine, X is O or S, R 2 , R 3 and R 4 , independently of one another, are H, straight-chain (C 1 -C 10 )alkyl or branched (C 3 -C 10 )alkyl, R 2 , R 3 and R 4 not simultaneously being H, have the property of increasing the phase width in CC mixtures or depressing the melting point.
Inventors
- 👤 Karsten Blatter
- 👤 Claus Escher
- 👤 Takamasa Harada
- 👤 Peter Harnischfeger
- 👤 Wolfgang Hemmerling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:00
CPC Classifications
C; C07; C07D; C07D405/00; C07D405/02; C07D405/12; C09; C09K; C09K19/00; C09K19/52; C09K19/58; C09K19/586; C09K19/588
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
142 words
A chiral compound containing a mesogenic aromatic unit, an alkene group and a chiral unit containing a heterocyclic three-membered ring, wherein, in the formula (I) ##STR11## the symbols have the following meanings: R 1 is straight-chain or branched (C 3 -C 12 )alkenyl containing a terminal double bond, it being possible for one or two non-adjacent CH 2 groups to be replaced by O and/or S atoms, A and B, independently of one another, are 1,4-phenylene, diazine-2,5-diyl or diazine-3,6-diyl, with the proviso that one of the groups A or B is phenyl and the other is diazine, X is O or S, and R 2 , R 3 and R 4 , independently of one another, are straight-chain (C 1 -C 10 )alkyl or branched (C 3 -C 10 )alkyl, R 2 , R 3 and R 4 not simultaneously being H.
Claim 2
Dependent Claim
142 words
A chiral compound containing a mesogenic aromatic unit, an alkene group and a chiral unit containing a heterocyclic three-membered ring, wherein, in the formula (I) ##STR11## the symbols have the following meanings: R 1 is straight-chain or branched (C 3 -C 12 )alkenyl containing a terminal double bond, it being possible for one or two non-adjacent CH 2 groups to be replaced by O and/or S atoms, A and B, independently of one another, are 1,4-phenylene, diazine-2,5-diyl or diazine-3,6-diyl, with the proviso that one of the groups A or B is phenyl and the other is diazine, X is O or S, and R 2 , R 3 and R 4 , independently of one another, are straight-chain (C 1 -C 10 )alkyl or branched (C 3 -C 10 )alkyl, R 2 , R 3 and R 4 not simultaneously being H.
Claim 3
Dependent Claim
67 words
A chiral compound as claimed in claim 1, wherein, in the formula (I), the symbols have the following meanings: R 1 is straight-chain (C 5 -C 11 )alkenyl, it being possible for one CH 2 group to be replaced by an O or S atom, X is O, R 2 and R 3 are H and R 4 is straight-chain or branched (C 3 -C 7 )alkyl.
Claim 4
Dependent Claim
14 words
A chiral compound as claimed in claim 1 or 2, wherein A is pyrimidine-2,5-diyl.
Claim 5
Dependent Claim
27 words
A twistable liquid-crystal phase containing at least one chiral compound, wherein it contains at least one chiral compound of the formula (I) as claimed in claim 1.
Claim 6
Dependent Claim
36 words
A twistable liquid-crystal phase as claimed in claim 4, which contains, in addition to at least one chiral compound of the formula (I) as claimed in claim 1, a phenylpyrimidine compound having an S c phase.
Claim 7
Dependent Claim
13 words
A liquid-crystal display element containing a liquid-crystal phase as claimed in claim 4.
References Cited (Backward Citations)
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US4876028A
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US4927244A
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US4988459A
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US4973425A
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US5206751A
Cited
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