Claims
- 1. A compound of the formula ##STR8## wherein A.sup.2 is 1,4-phenylene or trans-1,4-cyclohexylene; X.sup.1 is fluorine or chlorine; X.sup.2 is fluorine, or when X.sup.1 is chlorine, X.sup.2 also can be hydrogen or chlorine; and R.sup.1 is 1E-alkenyl with 2 to 12 carbon atoms.
- 2. The compound according to claim 1, wherein R.sup.1 is straight-chain, 1E-alkenyl.
- 3. The compound according to claim 1, wherein R.sup.1 is 1E-alkenyl with 2 to 7 carbon atoms.
- 4. The compound according to claim 3, wherein R.sup.1 is 1E-alkenyl with 2 to 5 carbon atoms.
- 5. The compound according to claim 1, wherein each of X.sup.1 and X.sup.2 is fluorine.
- 6. The compound according to claim 1, wherein X.sup.1 is chlorine and X.sup.2 is hydrogen.
- 7. A liquid crystalline mixture having at least two components, wherein at least one of said components is a compound of the formula ##STR9## wherein A.sup.2 is 1,4-phenylene or trans-1,4-cyclohexylene; X.sup.1 is fluorine or chlorine; X.sup.2 is fluorine, or when X.sup.1 is chlorine, X.sup.2 also can be hydrogen or chlorine; and R.sup.1 is 1E-alkenyl with 2 to 12 carbon atoms.
- 8. The liquid crystalline mixture according to claim 7, wherein the amount of compound I is of about 1 to about 50% by weight of the mixture.
- 9. The liquid crystalline mixture according to claim 8, wherein the amount of compound I is about 5 to about 30% by weight of the mixture.
- 10. An electro-optical cell comprising:
- a. two plate means;
- b. liquid crystal means disposed between the two plate means and including a compound of the formula ##STR10## wherein A.sup.2 is 1,4-phenylene or trans-1,4-cyclohexylene; X.sup.1 is fluorine or chlorine; X.sup.2 is fluorine, or when X.sup.1 is chlorine, X.sup.2 also can be hydrogen or chlorine; and R.sup.1 is 1E-alkenyl with 2 to 12 carbon atoms; and
- c. means for applying an electric potential to said plate means.
Priority Claims (1)
Number |
Date |
Country |
Kind |
4539/89 |
Dec 1989 |
CHX |
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Parent Case Info
This application is a continuation of application Ser. No. 07/620,877, filed Dec. 3, 1990, abandoned.
US Referenced Citations (17)
Foreign Referenced Citations (4)
Number |
Date |
Country |
122389 |
Oct 1984 |
EPX |
168683 |
Jan 1986 |
EPX |
269963 |
Jun 1988 |
EPX |
315014 |
May 1989 |
EPX |
Non-Patent Literature Citations (1)
Entry |
Schadt et al., Liquid Crystal, vol. 7, No. 4, 519-536 (1990). |
Continuations (1)
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Number |
Date |
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Parent |
620877 |
Dec 1990 |
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