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US4834904A
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US
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Nitrogen-containing heterocycles
Assignee: Hoechst AG
•
Filing: 1986-04-23
•
Granted: 1989-05-30
•
Expires: 2006-04-23
Abstract
Abstract Optically active nitrogen-containing heterocycles of the formula I according to claim 1 are suitable as components for ferroelectric liquid crystalline materials.
Inventors
- 👤 Joachim Krause
- 👤 Rudolf Eidenschink
- 👤 Klaus Bofinger
- 👤 Bernhard Scheuble
- 👤 Thomas Geelhaar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:59
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/28; C07D239/30; C07D213/00; C07D213/02; C07D213/04; C07D213/24; C07D213/28; C07D213/30; C07D237/00; C07D237/02; C07D237/06; C07D237/08; C07D237/10; C07D237/14; C07D239/26; C07D239/32; C07D239/34; C07D241/00; C07D241/02; C07D241/10; C07D241/12; C07D241/14; C07D241/18; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/34; C09K19/3441
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
81 words
A nitrogen-containing heterocycle of the formula ##STR24## in which R 1 is an alkyl or alkoxy group of 1-15 carbon atoms, A 1 is pyrimidine-2,5-diyl or pyridine-2,5-diyl, A 2 is 1,4-phenylene which is unsubstituted or substituted by one F atom, X is 13 O--CO-- or --O-- when A 1 is pyridine-2,5-diyl and --O--CO-- when A 1 is pyrimidine-2,5-diyl, Q is --CH 2 -- or a single bond, Y is halogen, and is an alkyl group of 1 to 10 carbon atoms.
Claim 2
Dependent Claim
81 words
A nitrogen-containing heterocycle of the formula ##STR24## in which R 1 is an alkyl or alkoxy group of 1-15 carbon atoms, A 1 is pyrimidine-2,5-diyl or pyridine-2,5-diyl, A 2 is 1,4-phenylene which is unsubstituted or substituted by one F atom, X is 13 O--CO-- or --O-- when A 1 is pyridine-2,5-diyl and --O--CO-- when A 1 is pyrimidine-2,5-diyl, Q is --CH 2 -- or a single bond, Y is halogen, and is an alkyl group of 1 to 10 carbon atoms.
Claim 3
Dependent Claim
29 words
A nitrogen-containing heterocycle according to claim 1, wherein A 1 -A 2 is a structural element of the formula ##STR25## X is --O--CO-- and Q is a single bond.
Claim 4
Dependent Claim
12 words
A nitrogen-containing heterocycle according to claim 1, wherein A 1 is pyrimidine-2,5-diyl.
Claim 5
Dependent Claim
12 words
A nitrogen-containing heterocycle according to claim 1, wherein A 1 is pyridine-2,5-diyl.
Claim 6
Dependent Claim
23 words
A nitrogen-containing heterocycle according to claim 1, wherein A 1 -A 2 is a structural element of the formulae 1 or 2: ##STR26##
Claim 7
Dependent Claim
10 words
A nitrogen-containing heterocycle of claim 1, wherein Y is Cl.
Claim 8
Dependent Claim
16 words
A nitrogen-containing heterocycle of claim 1, wherein X is --O--CO-- and Q is a single bond.
Claim 9
Dependent Claim
10 words
A nitrogen-containing heterocycle of claim 1, wherein X is --O--.
Claim 10
Dependent Claim
26 words
In a ferroelectric liquid crystalline phase comprising at least two liquid crystalline components, the improvement wherein at least one component is a ccompound of claim 1.
Claim 11
Dependent Claim
25 words
In an electro-optical display element comprising a liquid crystal cell having a liquid crystalline phase, the improvement wherein the phase is according to claim 3.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |