Claims
- 1. An optically active aromatic compound represented by the formula, ##STR123## wherein X represents --COO-- or --OCO--; Y represents --COO--, --OCO-- or --O--; R.sub.2 represents an alkyl or alkoxyalkyl group having 1 to 20 carbon atoms unsubstituted or substituted by a halogen atom; R.sub.1 represents an alkyl group having 3 to 20 carbon atoms;
- Z represents ##STR124## wherein p represents a number of 1 to 5 and * indicates an asymmetric carbon atom; l and k each represents a number of 1 or 2 provided that l+k.ltoreq.3; m and s each represents a number of 0 or 1.
- 2. The compound according to claim 1, wherein Z is ##STR125## wherein p is as defined in claim 1.
- 3. The compound according to claim 2, wherein X is --COO--.
- 4. The compound according to claim 1, wherein s represents 0.
- 5. The compound according to claim 1, wherein R.sub.1 is an alkyl group having 8 to 16 carbon atoms.
- 6. The compound according to claim 1, wherein R.sub.2 is an alkoxyalkyl group having 2 to 20 carbon atoms unsubstituted or substituted with a halogen atom.
- 7. A liquid crystal comprising at least one member selected from optically active aromatic compounds represented by the formula, ##STR126## wherein X represents --COO-- or --OCO--; Y represents --COO--, --OCO-- or --O--; R.sub.2 represents an alkyl or alkoxyalkyl group having 1 to 20 carbon atoms unsubstituted or substituted by a halogen atom; R.sub.1 represents an alkyl group having 3 to 20 carbon atoms;
- Z represents ##STR127## wherein p represents a number of 1 to 5 and * indicates an asymmetric carbon atom; l and k each represents a number of 1 or 2 provided that l+k.ltoreq.3; m and s each represents a number of 0 or 1.
- 8. A light switching element comprising a liquid crystal comprising at least one member selected from optically active aromatic compounds represented by the formula, ##STR128## wherein X represents --COO-- or --OCO--; Y represents --COO--, --OCO-- or --O--; R.sub.2 represents an alkyl or alkoxyalkyl group having 1 to 20 carbon atoms unsubstituted or substituted by a halogen atom; R.sub.1 represents an alkyl group having 3 to 20 carbon atoms;
- Z represents ##STR129## wherein p represents a number of 1 to 5 and * indicates an asymmetric carbon atom; l and k each represents a number of 1 or 2 provided that l+k.ltoreq.3; m and s each represents a number of 0 or 1.
Priority Claims (4)
Number |
Date |
Country |
Kind |
63-219504 |
Aug 1988 |
JPX |
|
63-229492 |
Sep 1988 |
JPX |
|
63-237121 |
Sep 1988 |
JPX |
|
63-238557 |
Sep 1988 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 07/422,090, filed Oct. 16, 1989 now abandoned; which in turn is a continuation-in-part of application Ser. No. 07/400,016, filed Aug. 29, 1989 now abandoned.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
4911863 |
Sage et al. |
Mar 1990 |
|
5002693 |
Higashii et al. |
Mar 1991 |
|
5013479 |
Minai et al. |
May 1991 |
|
5124070 |
Higashii et al. |
Jun 1992 |
|
Foreign Referenced Citations (7)
Number |
Date |
Country |
0255219 |
Feb 1988 |
EPX |
0255962 |
Feb 1988 |
EPX |
0284371 |
Mar 1988 |
EPX |
63-101483 |
May 1988 |
JPX |
63-135346 |
Jun 1988 |
JPX |
63-172788 |
Jul 1988 |
JPX |
8705012 |
Aug 1987 |
WOX |
Non-Patent Literature Citations (1)
Entry |
Patent Abstracts of Japan, 14th Oct. 1988, p. 166 C 536; & JP-A-63 135 346 (Canon Inc.) Jul. 06, 1988. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
422090 |
Oct 1989 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
400016 |
Aug 1989 |
|