Claims
- 1. An optically active compound of the formula: ##STR6## wherein R.sup.1 and R.sup.2 each are alkyl with at least 2 carbon atoms; n is an integer of 0 to 4; X is oxygen or a methylene group; and each of the two C.sup.* is a chiral carbon atom, one of the chiral carbon atoms having an R-configuration and another chiral carbon atom having an S-configuration.
- 2. The compound of claim 1 wherein R.sup.1 is an C.sub.3 -C.sub.10 alkyl group.
- 3. The compound of claim 1 wherein R.sup.1 is a propyl, butyl, pentyl, hexyl or heptyl group.
- 4. The compound of claim 1 wherein n is the number 0, 1 or 2.
- 5. The compound according to claim 1, 4-4'-biphenyl.
- 6. The compound according to claim 1, 4-3-methylpentyl]biphenyl.
- 7. A liquid crystalline mixture having at least two components, wherein at least one component is an optically active compound of the formula: ##STR7## wherein R.sup.1 and R.sup.2 each are alkyl with at least 2 carbon atoms; n is an integer of 0 to 4; X is oxygen or a methylene group; and each of the two C.sup.* is a chiral carbon atom, one of the chiral carbon atoms having an R-configuration and another chiral carbon atom having an S-configuration.
- 8. The mixture of claim 7 further comprising a neumatic carrier material.
- 9. A liquid crystal cell comprising:
- a) two plate means,
- b) a liquid crystal means disposed between the two plate means and including a compound of formula: ##STR8## wherein R.sup.1 and R.sup.2 each are alkyl with at least 2 carbon atoms; n is an integer of 0 to 4; X is oxygen or a methylene group; and each of the two C.sup.* is a chiral carbon atom, one of the chiral carbon atoms having an R-configuration and another chiral carbon atom having an S-configuration; and
- c) means for applying an electrical potential to said plate means.
Priority Claims (2)
Number |
Date |
Country |
Kind |
3245/87 |
Aug 1987 |
CHX |
|
2593/88 |
Jul 1988 |
CHX |
|
Parent Case Info
This is a continuation of application Ser. No. 07/758,245 filed Sep. 10, 1991, now abandoned, which is a continuation of copending application Ser. No. 07/234,222 filed on Aug. 19, 1988, now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (6)
Number |
Date |
Country |
0211646 |
Feb 1987 |
EPX |
0269062 |
Jun 1988 |
EPX |
3534778 |
Apr 1987 |
DEX |
3534780 |
Apr 1987 |
DEX |
3617826 |
Apr 1987 |
DEX |
PCTDE8700035 |
Aug 1987 |
WOX |
Non-Patent Literature Citations (3)
Entry |
Patent Abstract of Japan, vol. 12, No. 459 (C-547) 3297, Nov. 25, 1988, p. 75 C 547 Corresponding to JP application Ser. No. 63-175095. |
Patent Abstract of Japan, vol. 13, No. 233 (C-601) 3581, May 29, 1989, p. 81 C 601 Corresponding to JP application Ser. No. 1-42454. |
Derwent Abstract 80-05545C/04 corresponds to DE 2827471. |
Continuations (2)
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Number |
Date |
Country |
Parent |
758245 |
Sep 1991 |
|
Parent |
234222 |
Aug 1988 |
|