Tetracyclic compound having lateral halogen substituent and liquid crystal composition comprising the same
US6174458A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1999 |
| Grant date | Jan 16, 2001 |
| Priority date | — |
| Expiry date | Feb 26, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2601/14
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A tetracyclic compound expressed by the following general formula (1) ##STR1## wherein H.sub.1 to H.sub.12 represent hydrogen atom at least one of which is replaced by a halogen atom, when either H.sub.6 or H.sub.8 is replaced by a halogen atom, at least one of the remaining hydrogen atoms is replaced by a halogen atom; R.sub.1 and Y.sub.1 independently represent an alkyl group, alkoxy group, or alkoxyalkyl group having 1 to 20 carbon atoms, or an alkenyl group having 2 to 20 carbon atoms, one or more methylene group in R.sub.1 and Y.sub.1 may be replaced by oxygen atom, sulfur atom, dihydrosilylene group, dimethylsilylene group, --CH.dbd.CH--, or --C.tbd.C--; and X.sub.1, X.sub.2, and X.sub.3 independently represent a covalent bond, 1,2-ethylene group, or 1,4-butylene group; and a novel liquid crystal composition comprising the tetracyclic compound and having, at the same time, a wide temperature range of a nematic phase, high optical anisotropy, and high chemical stability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.