Optically active tolanes
US5681504A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 1995 |
| Grant date | Oct 28, 1997 |
| Priority date | — |
| Expiry date | Dec 5, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D317/32
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A chiral dopant of the formula ##STR1## wherein ring A is 1,4-phenylene which is optionally substituted with one or more fluorine atoms, chlorine atoms, bromine atoms, cyano groups, or methyl groups, and in which one or two CH groups can be replaced by nitrogen, or is trans-1,4-cyclohexylene; PA1 Z is a single covalent bond, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O-- or --OCH.sub.2 --; X.sup.1,X.sup.2,X.sup.3,X.sup.4 each independently are hydrogen or fluorine; PA1 R.sup.1 is hydrogen, is alkyl with 1 to 12 carbon atoms which is optionally substituted with one or more fluorine or chlorine atoms and in which one or two non-adjacent CH.sub.2 groups can be replaced by --0--, is alkenyl with 2 to 12 carbon atoms, which is optionally substituted with one or more fluorine or chlorine atoms and in which one or two non-adjacent CH.sub.2 groups can be replaced by --O--, is a group of the formula ##STR2## and when R.sup.1 is bonded to an aromatic ring, can also be fluorine, chlorine, cyano, CF.sub.3, OCHF.sub.2 or --OCF.sub.3 ; PA1 R.sup.2, R.sup.3, R.sup.4, R.sup.5 are alkyl with 1 to 8 carbon atoms or alkenyl with 2 to 8 carbon atoms; PA1 n is 0 or 1; and PA1 * is a center of chirality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.