2-fluoropyrazines process for their preparation, and their use in liquid-crystalline mixtures
US5562859A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1995 |
| Grant date | Oct 8, 1996 |
| Priority date | — |
| Expiry date | Jun 1, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K19/588
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
2-Fluoropyrazines, process for their preparation, and their use in liquid-crystalline mixtures PA0 A 2-fluoropyrazine of the formula (I) ##STR1## in which the symbols have the following meanings: R.sup.1 and R.sup.2, independently of one another, are, for example, H or straight-chain or branched alkyl, PA1 A.sup.1, A.sup.2, A.sup.3 and A.sup.4 are identical or different and are, for example, 1,4-phenylene or PA1 M.sup.1, M.sup.2, M.sup.3 and M.sup.4 are identical or different and are, for example, --0-- or --CO--O--, PA1 R.sup.3, R.sup.4, R.sup.6 and R.sup.7, independently of one another, are, for example, H or straight-chain or branched alkyl, PA1 M.sup.5 is, for example, --O--CO-- or a single bond, PA1 k, l, m, n, o, p, q and r are zero or one, with the condition that the sum of k+m+p+r is less than 4 and greater than zero, can advantageously be employed as a component in liquid-crystal mixtures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.