US4597892A
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Liquid crystalline 2-substituted-5-(1-alkyl-piperid-4-yl)-1,3-dioxanes
Assignee: Werk fuer Fernsehelektronik im VEB Kombinat Mikroelektronik VEB
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Filing: 1985-06-26
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Granted: 1986-07-01
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Expires: 2005-06-26
Abstract
Abstract 2-Substituted-5-(1-alkyl-piperid-yl)-1,3-dioxanes of the formula I ##STR1## wherein R= ##STR2## R 1 =--C n H 2n+1 , --OC n H 2n+1 , --OOCC n H 2n+1 , --COC n H 2n+1 , --OOCOC n H 2n+1 , --F, --Cl, --Br, --I, --NO 2 , --CN --(CH 2 ) 2 CN, ##STR3## and n=1 to 10, are novel liquid crystalline compounds, which can be produced in high yields by means of reacting 2-(1-alkyl-piperid-4-yl)-propane-1,3-diols with aldehydes in the presence of acid catalysts, such as p-toluenesulfonic acid, mineral acids and Lewis acids. Because of their high thermal and chemical stability, which is also transferred to mixtures, the compounds of the formula I are very well suited for utilization in optoelectronic displays.
Inventors
- 👤 Horst Zaschke
- 👤 Hans-Matthias Vorbrodt
- 👤 Wilfried Fuchs
- 👤 Adelbert Wiegeleben
- 👤 Dietrich Demus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:24
CPC Classifications
C; C07; C07D; C07D405/00; C07D405/02; C07D405/04; C07D211/00; C07D211/04; C07D211/06; C07D211/08; C07D211/18; C07D211/20; C07D211/22; C07D211/34; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/34; C09K19/3441; C09K19/3483
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
60 words
Liquid crystalline 5-(1-alkyl-piperid-4-yl)-1,3-dioxanes of the general formula I ##STR22## wherein R=one of ##STR23## R 1 =one of --C n H 2n+1 , --OC n H 2n+1 , --OOCC n H 2n+1 , --COC n H 2n+1 , --OCOOC n H 2n+1 , --F, --Cl, --Br, --I, --NO 2 , --CN, --(CH 2 ) 2 CN, ##STR24## and n=1 to 10.
Claim 2
Dependent Claim
60 words
Liquid crystalline 5-(1-alkyl-piperid-4-yl)-1,3-dioxanes of the general formula I ##STR22## wherein R=one of ##STR23## R 1 =one of --C n H 2n+1 , --OC n H 2n+1 , --OOCC n H 2n+1 , --COC n H 2n+1 , --OCOOC n H 2n+1 , --F, --Cl, --Br, --I, --NO 2 , --CN, --(CH 2 ) 2 CN, ##STR24## and n=1 to 10.
Claim 3
Dependent Claim
11 words
Liquid crystalline substances of claim 1, wherein n=3 and R= ##STR25##
Claim 4
Dependent Claim
11 words
Liquid crystalline substances of claim 1, wherein n=3 and R= ##STR26##
Claim 5
Dependent Claim
11 words
Liquid crystalline substances of claim 1, wherein n=4 and R= ##STR27##
Claim 6
Dependent Claim
11 words
Liquid crystalline substances of claim 1, wherein n=4 and R= ##STR28##
Claim 7
Dependent Claim
11 words
Liquid crystalline substances of claim 1, wherein n=4 and R= ##STR29##
Claim 8
Dependent Claim
11 words
Liquid crystalline substances of claim 1, wherein n=4 and R= ##STR30##
Claim 9
Dependent Claim
11 words
Liquid crystalline substances of claim 1, wherein n=4 and R= ##STR31##
Claim 10
Dependent Claim
11 words
Liquid crystalline substances of claim 1, wherein n=4 and R= ##STR32##
Claim 11
Dependent Claim
14 words
Liquid crystalline substances of claim 1, wherein n=4 and R=C 6 H 13 --.
Claim 12
Dependent Claim
11 words
Liquid crystalline substances of claim 1, wherein n=4 and R= ##STR33##
Claim 13
Dependent Claim
11 words
Liquid crystalline substances of claim 1, wherein n=6 and R= ##STR34##
Claim 14
Dependent Claim
11 words
Liquid crystalline substances of claim 1, wherein n=6 and R= ##STR35##
Claim 15
Dependent Claim
71 words
In an opto-electronic display containing at least one nematic liquid crystalline substance, the improvement in which the at least one nematic liquid crystalline substance is selected from the group consisting of nematic liquid crystalline substances according to claim 1, mixtures of nematic liquid crystalline substances according to claim 1, and mixtures of at least one nematic liquid crystalline substance according to claim 1 with at least one other nematic crystalline substance.
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