Stable liquid crystalline or mesogenic 3-fluoro-cyclohexenyl derivatives

摘要

Substituted 3-fluoro-cyclohex-3-en-1-yl derivatives of formula (I) are new; in which R1 = hydrogen (H), 1-15 carbon (C) alk(en)yl, optionally mono-substituted by cyano (CN) or trifluoromethyl (CF3) or at least mono-substituted by halogen, in which 1 or more methylene groups (CH2) may be replaced by oxygen (-O-), sulphur (-S-), 1,3-cyclobutylene, carbonyl (-CO-, carboxyl (-CO-O- or -O-CO-) or carbonate (-O-CO-O-) without directly linked O atoms; A1, A2 = (a) trans-1,4-cyclohexylene, in which 1 or more non-adjacent CH2 groups may be replaced by -O- and/or -S-; (b) 1,4-phenylene, in which 1 or 2 CH groups may be replaced by nitrogen (N); (c) 1,4-cyclohexenylene; or (d) 1,4-cyclohexenylene, 1,4-bicyclo(2,2,2)-octylene, piperidin-1,4-diyl, naphth-2,6-diyl, decahydronaphth-2,6-diyl or 1,2,3,4-tetrahydronaphth-2,6-diyl, in which groups (a-c) may be mono- or di-substituted by fluorine (F); Z1, Z2 = -CO-O-, -O-CO-, methyleneoxy (-CH2O- or -OCH2-), ethylene (-CH2CH2-), ethenylene (-CH=CH-), acetylene (-C?=C-), butylene (-(CH2)4-), butenylene (-CH=CH-CH2CH2-) or a single bond; m = 0, 1 or 2; L1 = F, chlorine (Cl), CN, isocyanato (NCO), isothiocyanato (NCS) or optionally substituted 1-6 C alk(en)yl, in which 1 or more CH2 groups may be replaced by -O-, -CO- or -CO-O- without directly linked O atoms. Also claimed is a liquid crystalline (LC) medium containing >= 2 LC components, including compound(s) (I).