US4897216A
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2,3-difluorophenol derivatives
Assignee: Merck Patent GmbH
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Filing: 1989-03-09
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Granted: 1990-01-30
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Expires: 2009-03-09
Abstract
Abstract 2,3-Difluorophenol derivatives of the formula ##STR1## wherein R 1 and R 2 , in each case independently of one another, are an alkyl group having 1 to 15 C atoms in which, in addition, one or two nonadjacent CH 2 groups may be replaced by --O--, --CO--, --CH═CH-- and/or --C.tbd.C--; A is 1,4-phenylene which is unsubstituted or substituted by one or two fluorines, or is trans-1,4-cyclohexylene or a single bond; and L 1 and L 2 , in each case independently of one another, are H or F, are suitable as components of liquid-crystalline media.
Inventors
- 👤 Volker Reiffenrath
- 👤 Joachim Krause
- 👤 Andreas Wachtler
- 👤 Georg Weber
- 👤 Thomas Geelhaar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:21
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/30; C09K19/3001; C09K19/3066; C09K19/3068
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
89 words
A 2,3-difluorophenol derivative of the formula ##STR4## wherein R 1 and R 2 , in each case independently of one another, are an alkyl group having 1-15 C atoms, wherein one or each CH 2 group of two nonadjacent CH 2 groups can be replaced by --O--, --CO--, --CH═CH-- or --C═C--; A is 1,4-phenylene which is unsubstituted or substituted by one or two fluorines, or is trans-1,4-cyclohexylene or a single bond; and L 1 and L 2 , in each case independently of one another, are H or F.
Claim 2
Dependent Claim
89 words
A 2,3-difluorophenol derivative of the formula ##STR4## wherein R 1 and R 2 , in each case independently of one another, are an alkyl group having 1-15 C atoms, wherein one or each CH 2 group of two nonadjacent CH 2 groups can be replaced by --O--, --CO--, --CH═CH-- or --C═C--; A is 1,4-phenylene which is unsubstituted or substituted by one or two fluorines, or is trans-1,4-cyclohexylene or a single bond; and L 1 and L 2 , in each case independently of one another, are H or F.
Claim 3
Dependent Claim
32 words
A compound according to claim 1, of the subformula Ia R.sup.1 --Phe--COO--PheF.sub.2 --CH.sub.2 R.sup.2 Ia wherein Phe is a 1,4-phenylene group and PheF 2 is a group of the part formula ##STR5##
Claim 4
Dependent Claim
32 words
A compound according to claim 1, of the subformula Ib R.sup.1 --Phe--Phe--COO--PheF.sub.2 --CH.sub.2 R.sup.2 Ib wherein Phe is a 1,4-phenylene group and PheF 2 is a group of the part formula ##STR6##
Claim 5
Dependent Claim
37 words
A compound according to claim 1, of the subformula Ic R.sup.1 --Cyc--Phe--COO--PheF.sub.2 --CH.sub.2 R.sup.2 Ic wherein Phe is a 1,4-phenylene group; Cyc is a 1,4-cyclohexylene group; and PheF 2 is a group of the part formula ##STR7##
Claim 6
Dependent Claim
16 words
A compound according to claim 1, wherein R 1 and/or R 2 are alkyl or alkoxy.
Claim 7
Dependent Claim
20 words
A compound according to claim 1, wherein one of the radicals R 1 and R 2 is alkenyl or oxaalkyl.
Claim 8
Dependent Claim
14 words
A compound according to claim 1, wherein A is unsubstituted 1,4-phenylene or is 1,4-cyclohexylene.
Claim 9
Dependent Claim
17 words
A compound according to claim 1, wherein R 1 and R 2 each have 2-12 C atoms.
Claim 10
Dependent Claim
17 words
A compound according to claim 1, wherein R 1 and R 2 each have 3-10 C atoms.
Claim 11
Dependent Claim
26 words
A compound according to claim 1, wherein in the groups R 1 and R 2 only one CH 2 group is replaced by --O-- or --CH═CH--.
Claim 12
Dependent Claim
31 words
A compound according to claim 1, wherein one or each CH 2 group of two nonadjacent CH 2 groups of R 1 and R 2 is replaced by an O atom.
Claim 13
Dependent Claim
33 words
A compound according to claim 1, wherein R 1 and/or R 2 are alkyl radicals in which one CH 2 group is replaced by --CH═CH-- and the radicals are in the trans form.
Claim 14
Dependent Claim
22 words
A compound according to claim 12, wherein R 1 and/or R 2 is a straight chain alkenyl radical having 2-10 C atoms.
Claim 15
Dependent Claim
17 words
A compound according to claim 1, wherein R 1 and/or R 2 is a straight chain radical.
Claim 16
Dependent Claim
23 words
A compound according to claim 1, wherein R 1 and/or R 2 is a branched radical having not more than 1 chain branch.
Claim 17
Dependent Claim
18 words
A liquid-crystalline medium having at least two liquid-crystalline components, comprising at least one compound according to claim 1.
Claim 18
Dependent Claim
15 words
An electrooptical display element, comprising a liquid-crystalline medium according to claim 16, as the dielectric.
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