Patent ID: 6468608
Filing Date: 2002-10-22
Classification: C07C,C09K

Abstract:
A liquid-crystalline compound of the formula I in whichR1 and R2 are each, independently of one another, an alkyl or alkenyl radical having 1 to 15 carbon atoms which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, where one or more CH2 groups in these radicals may also, in each case independently of one another, be replaced by â€”Oâ€”, â€”Sâ€”, â€”&diam;â€”, â€”COâ€”, â€”COâ€”Oâ€”, â€”Oâ€”COâ€” or â€”Oâ€”COâ€”Oâ€” in such a way that O atoms are not linked directly to one another, A1 (a) is a trans-1,4-cyclohexylene radical, in which, in addition, one or more non-adjacent CH2 groups may, in each case, be replaced by â€”Oâ€” or â€”Sâ€”, (b) a 1,4-phenylene radical, in which, in addition, one or two CH groups may, in each case, be replaced by N, (c) a 1,4-cyclohexenylene radical, (d) a radical from the group consisting of 1,4-bicyclo[2.2.2]octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1,2,3,4-tetrahydronaphthalene-2,6-diyl, where the radicals (a), (b) and (c) are each, optionally, monosubstituted or polysubstituted by CN or fluorine, Z1, Z2 and Z3 are each, independently of one another, â€”COâ€”Oâ€”, â€”Oâ€”COâ€”, â€”CH2Oâ€”, â€”OCH2â€”, â€”CH2CH2â€”, â€”CH&boxH;CHâ€”, â€”Câ‰¡Câ€”, â€”CF2Oâ€”, â€”OCF2â€”, â€”(CH2)4â€”, a single bond, L1 to L6 are each, independently of one another, H or F, wherein at least one of the radicals L1 and L2 is F or at least one of L3 to L6 is F, m is 0 or 1, and n is 1 or 2, with the proviso that at least one bridge Z1, Z2 or Z3 is