| abstract |
3,4,5-trifluoronaphthalene derivs. of formula (I) are new: R<1>(-M<1>)a(-A<1>)b(-M<2>)c(-A<2>)d(-M<3>)e-B(m<4>)f(-A<3>)g(-M<5>)h (-A<4>)i(-M<6>)k-R<2> (I); B= 3,4,5-trifluoro-naphthalene-2,6-diyl; R<1>, R<2> = (a) H, CN, F, Cl, CF3, CHF2, CH2F, OCF3, OCHF2 or OCH2F; (b) 1-20 C alkyl (opt. with an asymmetrical C atom), in which 1 or more CH2 gps. may be replaced by -O-, -S-, -CO-O-, -O-CO-, -O-CO-O-, -CO-, -CS-, -CH=CH-, -C=C-, cyclopropan-1,2-diyl, -SiMe2-, 1,4-phenylene, trans-1,4-cyclohexylene or trans-1,3-cyclopentylene, without directly linked O and/or S atoms, and/or with 1 or more, F, Cl, Br, OR<3>, -SCN, -OCN or N3 substit(s).; or (c) an (optically active or racemic) gp. of formulae (IIA-S): R<3-7> = H; 1-16 C alkyl (opt. with an asymmetrical C atom), in which 1 or more CH2 gps. may be replaced by -O- and/or -CH=CH-, without directly linked O atoms, and/or with 1 or more F or Cl substit(s).; or R<4>, R<5> = -(CH2)5- or -(CH2)5- if attached to an oxirane, dioxolane, tetrahydrofuran, tetrahydropyran, butyrolactone or valerolactone system; Y = Cl, F or CN; Z = -CO- or -CH2-; M<1>-M6 = -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O- -CO-S-, -S-CO-, -CS-O-, -O-CS-, -S-CS-S, -O-CS-O-, -S-CO-S-, -CS-, -CH2-O-, -O-CH2-, -S-CH2-, -CH=CH-, -C=C-, -CH2-CH2-CO-O-, -O-CO-CH2-CH2- or a single bond; A<1>-A<4> - 1,4-phenylene, pyridin-2,5-diyl, naphthalen-2,6-diyl or bicyclo(2.2.2)-octan-1,4-diyl, opt. with 1 or more F, Cl and/or CN substit(s).; pyrazin-2,5-diyl, pyridazin-3-6-diyl, pyrimidin-2,5-diyl or thiophen-2,5-diyl, opt. with 1 or 2 F, Cl and/or CN substits.; 1,3-thiazol-2,4- or -2,5-diyl or thiophen-2,4-diyl, opt. with one F, Cl and/or CN substit.; trans-1,4-cyclohexylene, opt. with 1 or 2 CN and/or Me substits.; (1,3,4)-thiadiazol-2,5-diyl; 1,3-dioxan-2,5-diyl; 1,3-dithian-2,5-diyl; piperazin-1,4- or -2,5-diyl; 1,3-dioxaborinan-2,5-diyl; or a B gp.; a,b,c,d,e,f,g,h,i,k = 0 or 1. Also claimed are liquid crystal (LC) mixts. contg. (I). |