Claims
- 1. A compound containing a molecular structural element with two chirality centers and at least one mesogenic molecular structural element, which compound has the formula (I) ##STR13## wherein: two of Y.sup.1, Y.sup.2, Y.sup.3 and Y.sup.4 are hydroxy and MC--CO--O, or independently of each other MC--CO--O and the other two of Y.sup.1, Y.sup.2, Y.sup.3 and Y.sup.4 are independently of each other (C.sub.1 -C.sub.10)alkoxy, wherein MC is a mesogenic group of the formula (II)
- R--(A.sup.1 --).sub.n1(B--).sub.n2 (A.sup.2 --).sub.n3 (II)
- wherein:
- R is a straight-chain or branched (C.sub.1 -C.sub.12)alkyl group, in which one CH.sub.2 group may be replaced by an O atom,
- A.sup.1, A.sup.2 are independently of each other 1,4-phenylene, diazine-2,5-diyl, diazine-3,6-diyl, or 1,4-cyclohexylene, with the proviso that A.sup.1 and A.sup.2 are not both heterocyclic at the same time,
- B is CO--O, O--CO, CH.sub.2 --CH.sub.2, OCH.sub.2 or CH.sub.2 O, and
- n1, n2, n3 are independently of each other 0 or 1, n1 and n3 not being 0 at the same time.
- 2. A twistable liquid crystal mixture containing at least two components, wherein at least one component is a chiral compound of the formula (I) as claimed in claim 1.
- 3. A liquid crystal mixture as claimed in claim 2 wherein the chiral compound of the formula (I) is present in an amount of from 0.01 to 70% by weight.
- 4. A compound containing a molecular structural element with two chirality centers and at least one mesogenic molecular structural element, which compound has the formula (I) ##STR14## wherein Y.sup.1 and Y.sup.4 are hydroxy and MC--CO--O, or independently of each other MC--CO--O and Y.sup.2 and Y.sup.3 together form a dioxolane ring, or Y.sup.1 and Y.sup.4 jointly are O and form a tetrahydrofuran ring, and Y.sup.2 and Y.sup.3 are hydroxy and MC--CO--O or, independently of each other, MC--CO--O, wherein MC is a mesogenic group of the formula (II)
- R--(A.sup.1 --).sub.n1 (B--).sub.n2 (A.sup.2 --).sub.n3 (II)
- wherein:
- R is a straight-chain or branched (C.sub.1 -C.sub.12)alkyl group, in which one CH.sub.2 group may be replaced by an O atom,
- A.sup.1, A.sup.2 are independently of each other 1,4-phenylene, diazine-2,5-diyl, diazine-3,6-diyl, or 1,4-cyclohexylene, with the proviso that A.sup.1 and A.sup.2 are not both heterocyclic at the same time,
- B is CO--O, O--CO, CH.sub.2 --CH.sub.2, OCH.sub.2 or CH.sub.2 O, and
- n1, n2, n3 are independently of each other 0 or 1 n1 and n3 not being 0 at the same time.
- 5. A twistable liquid crystal mixture containing at least two components, wherein at least one component is a chiral compound of the formula (I) as claimed in claim 4.
- 6. A liquid crystal mixture as claimed in claim 5 wherein the chiral compound of the formula (I) is present in an amount of from 0.01 to 70% by weight.
- 7. A compound containing a molecular structural element with two chirality centers and at least one mesogenic molecular structural element, which compound has the formula (I) ##STR15## wherein: Y.sup.1 and Y.sup.4 are independently of each other MC--CO--O and Y.sup.2 and Y.sup.3 are independently of each other (C.sub.1 -C.sub.10)alkoxy, wherein MC is a mesogenic group of the formula (II)
- R--(A.sup.1 --).sub.n1 (B--).sub.n2 (A.sup.2 --).sub.n3 (II)
- wherein:
- R is a straight-chain or branched (C.sub.1 -C.sub.12)alkyl group, in which one CH.sub.2 group may be replaced by an O atom,
- A.sup.1, A.sup.2 are independently of each other 1,4-phenylene, diazine-2,5-diyl, diazine-3,6-diyl, or 1,4-cyclohexylene, with the proviso that A.sup.1 and A.sup.2 are not both heterocyclic at the same time,
- B is CO--O, O--CO, CH.sub.2 --CH.sub.2, OCH.sub.2 or CH.sub.2 O, and
- n1, n2, n3 are independently of each other 0 or 1 n1 and n3 not being 0 at the same time.
- 8. A twistable liquid crystal mixture containing at least two components, wherein at least one component is a chiral compound of the formula (I) as claimed in claim 7.
- 9. A liquid crystal mixture as claimed in claim 8 wherein the chiral compound of the formula (I) is present in an amount of from 0.01 to 70% by weight.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3604899 |
Feb 1986 |
DEX |
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Parent Case Info
This application is a continuation of application Ser. No. 07/014,465, filed Feb. 13, 1987, abandoned.
US Referenced Citations (5)
Number |
Name |
Date |
Kind |
4264148 |
Gobl-Wunsch et al. |
Apr 1981 |
|
4584120 |
Fujii et al. |
Apr 1986 |
|
4650600 |
Heppke et al. |
Mar 1987 |
|
4673529 |
Sugimori et al. |
Jun 1987 |
|
4686289 |
Huynh-Ba et al. |
Aug 1987 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
0168043 |
Jan 1986 |
EPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
14465 |
Feb 1987 |
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