US4478740A
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Benzonitriles
Assignee: Merck Patent GmbH
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Filing: 1983-02-18
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Granted: 1984-10-23
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Expires: 2003-02-18
Abstract
Abstract New benzonitriles of formula I ##STR1## wherein R 1 and R 2 are each alkyl groups of 1-8 C atoms, and one of these radicals can also be alkoxy of 1-8 C atoms, and Q is one or two radicals selected from 1,4-phenylene, 1,4-cyclohexylene and/or 1,4-bicyclo[2.2.2] octylene, are very useful for preparing liquid crystallene dielectrics and electrooptical display elements based thereon.
Inventors
- 👤 Rudolf Eidenschink
- 👤 Jurgen Eichler
- 👤 Georg Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:07
CPC Classifications
C; C07; C07C; C07C255/00; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/12; C09K19/30; C09K19/3001; C09K19/3003; C09K19/32; C09K19/321
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
49 words
A benzonitrile of the formula ##STR5## wherein R 1 and R 2 are each independently alkyl of 1-8 C atoms, or one is C 1-8 -alkyl and the other is alkoxy of 1-8 C atoms; and Q is one or two groups selected from 1.4-phenylene, 1,4-cyclohexylene and/or 1,4-bicyclo[2.2.2 ]-octylene.
Claim 2
Dependent Claim
49 words
A benzonitrile of the formula ##STR5## wherein R 1 and R 2 are each independently alkyl of 1-8 C atoms, or one is C 1-8 -alkyl and the other is alkoxy of 1-8 C atoms; and Q is one or two groups selected from 1.4-phenylene, 1,4-cyclohexylene and/or 1,4-bicyclo[2.2.2 ]-octylene.
Claim 3
Dependent Claim
40 words
A compound of claim 1 of the formula R.sup.1 --Phe--Phe(CN)--R.sup.2 R.sup.1 --Cy--Phe(CN)--R.sup.2 R.sup.1 Cy--Phe--Phe(CN)--R.sup.2 R.sup.1 --Bi--Phe--Phe(CN)--R.sup.2, wherein Phe is 1,4-phenylene, Cy is 1,4-cyclohexylene, Bi is 1,4-bicyclo[2.2.2]octylene and Phe(CN) is 1,4-phenylene substituted by nitrilo in the 2-, 3-, 5- or 6-position.
Claim 4
Dependent Claim
46 words
A compound of claim 1 of the formula R.sup.1 --Bi--Phe(CN)--R.sup.2 R.sup.1 --Cy--Cy--Phe(CN)--R.sup.2 R.sup.1 --Phe--Phe--Phe(CN)--R.sup.2 R.sup.1 --Phe--Cy--Phe(CN)--R.sup.2 R.sup.1 --Bi--Cy--Phe(CN)--R.sup.2 R.sup.1 --Phe--Bi--Phe(CN)--R.sup.2 R.sup.1 --Bi--Bi--Phe(CN)--R.sup.2 wherein Phe is 1,4-phenylene, Cy is 1,4-cyclohexylene, Bi is 1,4-bicyclo[2.2.2]octylene and Phe(CN) is 1,4-phenylene substituted by nitrilo in the 2-, 3-, 5- or 6-position.
Claim 5
Dependent Claim
14 words
A compound of claim 1 wherein R 1 and R 2 are straight chained.
Claim 6
Dependent Claim
23 words
A compound of claim 1 wherein only one of R 1 or R 2 is branched and it has only one chain branching.
Claim 7
Dependent Claim
16 words
A compound of claim 1 wherein R 1 and R 2 each have 3-5 C atoms.
Claim 8
Dependent Claim
13 words
A compound of claim 4 wherein R 1 and R 2 are alkyl.
Claim 9
Dependent Claim
13 words
A compound of claim 2 of the formula R.sup.1 --Phe--Phe(CN)--R.sup.2 or R.sup.1 --Bi--Phe--Phe(CN)--R.sup.2.
Claim 10
Dependent Claim
18 words
A compound of claim 3 of the formula R.sup.1 --Bi--Phe(CN)--R.sup.2 R.sup.1 --Phe--Phe--Phe(CN)--R.sup.2 R.sup.1 --Bi--Cy--Phe(CN)--R.sup.2 R.sup.1 --Phe--Bi--Phe(CN)--R.sup.2 R.sup.1 --Bi--Bi--Phe(CN)--R.sup.2.
Claim 11
Dependent Claim
20 words
A compound of claim 1 of the formula R.sup.1 --Cy--Bi--Phe(CN)--R.sup.2 R.sup.1 --Bi--Phe--Phe(CN)--R.sup.2 R.sup.1 --Bi--Phe(CN)--R.sup.2 R.sup.1 --Bi--Cy--Phe(CN)--R.sup.2 R.sup.1 --Phe--Bi--Phe(CN)--R.sup.2 R.sup.1 --Bi--Bi--Phe(CN)--R.sup.2.
Claim 12
Dependent Claim
27 words
A liquid crystal dielectric useful in electrooptical display elements comprising at least two liquid crystal compounds, wherein at least one compound is a benzonitrile of claim 1.
Claim 13
Dependent Claim
12 words
A liquid crystal dielectric of claim 11 comprising 3-12 liquid crystal compounds.
Claim 14
Dependent Claim
17 words
A liquid crystal dielectric of claim 11 wherein the amount of said benzonitrile is 0.1-60 wt. %.
Claim 15
Dependent Claim
26 words
In an electrooptical display element based on a liquid crystal cell comprising a liquid crystal dielectric, the improvement wherein the dielectric is that of claim 11.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
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