New liquid crystalline cyclopenta-(a)-naphthalene derivatives having negative dielectric anisotropy, useful in liquid crystal displays, especially of the TFT-VA type

摘要

Phenyl-, cyclohexyl-, cyclohexenyl- or cyclohexadienyl-substituted cyclopenta-(a)-naphthalene derivatives (I) are new. Cyclopentanaphthalene derivatives of formula (I)-(V) and their salts are new. [Image] ring B : groups of formulae (a)-(i): [Image] A : 1,4-phenylene (optionally having one or two CH replaced by N and optionally substituted by 1-4 of halo, CN, Me, CH 2F, CHF 2, CF 3, OMe, OCH 2F, OCHF 2 or OCF 3); or 1,4-cyclohexylene, 1,4-cyclohexenylene or 1,4-cyclohexadienylene (all optionally having one or two non-adjacent CH 2 replaced by O or S and optionally substituted by one or more halo); Z : single or double bond, CF 2O, OCF 2, CH 2CH 2, CF 2CF 2, CF 2CH 2, CH 2CF 2, CHFCHF, C(O)O, OC(O), CH 2O, OCH 2, CF=CH, CH=CF, CH=CH or acetylene; R : H; 1-15C alkyl, 1-15C alkoxy, 2-15C alkenyl or 2-15C alkynyl (all optionally having one or two CH 2 replaced by O, S, CO, COO, OCO or OCOO (provided that heteroatoms are not directly linked) and optionally substituted by one CN or CF 3 or by one or more halo); or halo, CN, SCN, NCS, SF 5, CF 3, OCF 3, OCHF 2 or OCH 2F; X 1, X 1a, X 1b, X 2, X 3H; 1-15C alkyl, 1-15C alkoxy, 2-15C alkenyl or 2-15C alkynyl (all optionally having one or two CH 2 replaced by O, S, CO, COO, OCO or OCOO (provided that heteroatoms are not directly linked) and optionally substituted by one or more halo); or halo, CN, SCN, NCS, SF 5, CF 3, OCF 3, OCHF 2 or OCH 2F; E 1, E 2H; 1-15C alkyl, 1-15C alkoxy, 2-15C alkenyl or 2-15C alkynyl (all optionally having one or two CH 2 replaced by O, S, CO, COO, OCO or OCOO (provided that heteroatoms are not directly linked) and optionally substituted by one CN or CF 3 or by one or more halo); or halo, CN, SCN, NCS, SF 5, CF 3, OCF 3, OCHF 2, OCH 2F or -(Z-A) n-R; n : 1-3 Independent claims are included for: (1) a liquid crystalline media containing at least two liquid crystalline compounds, at least one of which is a compound (I); and (2) electrooptical display elements containing such liquid crystalline media.