New stable, liquid crystalline fluorinated phenanthrene or 9,10-dihydrophenathrene derivatives having a high clear point, useful in liquid crystalline media for electrooptical displays

摘要

Optionally fluorinated phenanthrene or 9,10-dihydrophenathrene derivatives (I), carrying an alkyl or alkylene chain (optionally bonded via linking groups) in the 2-position, are new. Liquid crystalline phenanthrene or dihydrophenathrene derivatives of formula (I) are new. R = 1-15C alkyl or 2-15C alkenyl (both optionally substituted by one CN or CF3 or by one or more halo; and optionally having one or more CH2 groups replaced by O, S, CC, COO or OCO, provided that O atoms are not directly bonded to each other); A1 = 1,4-cyclohexenylene or 1,4-cyclohexylene (both optionally having 1 or 2 non-adjacent CH2 groups replaced by O or S) or 1,4-phenylene (optionally having 1 or 2 CH groups replaced by N), all optionally substituted by one or more F; Z1 = COO, OCO, CF2O, OCF2, CH2O, OCH2, CH2CH2, C2F4, CH=CH, CC or a direct bond; Y = H, F, Cl, CN, SF5, NCS or SCN; or 1-5C alkyl, 2-5C alkenyl, 2-5C alkenyloxy or 1-5C alkoxy, all mono- or polysubstituted by halo; G = CH2CH2, CH=CF or CH=CH; L1 - L5 = H or F; m = 0-2. An Independent claim is included for a liquid crystalline medium (A) containing at least two mesogenic compounds, which contains at least one compound (I).