Patent ID: 6780477
Filing Date: 2004-08-24
Classification: C07B,C07C,C07D,C09K

Abstract:
A liquid-crystalline compound of formula I in whichR1 and R2 are each, independently of one another, an alkyl radical having from 1 to 15 carbon atoms which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, where, in addition, one or more CH2 groups are each optionally replaced by â€”Oâ€”, â€”Sâ€”, â€”CH&boxH;CHâ€”, â€”Câ‰¡Câ€”, â€”OCâ€”Oâ€” or â€”Oâ€”COâ€” in such a way that O atoms are not linked directly to one another, and R2 can also be CN, SF5, F, Cl, NCS or SCN, A1, A2, A3 and A4 are a) a 1,4-cyclohexenylene or 1,4-cyclohexylene radical, in which in each case one or two non-adjacent CH2 groups are each optionally replaced by â€”Oâ€” or â€”Sâ€”, b) a 1,4-phenylene radical, in which one or two CH are each optionally replaced by N, c) a radical from the group consisting of piperidine-1,4-diyl, 1,4-bicyclo[2.2.2]octylene, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1,2,3,4-tetrahydronaphthalene-2,6-diyl, â€ƒwhere the radicals a), b) and c) are in each case unsubstituted or monosubstituted or polysubstituted by halogen atoms, Z1 and Z2 are each, independently of one another, â€”COâ€”Oâ€”, â€”Oâ€”COâ€”, â€”CF2Oâ€”, â€”OCF2â€”, â€”CH2Oâ€”, â€”OCH2â€”, â€”CH2CH2â€”, â€”(CH2)4â€”, â€”C2F4â€”, â€”CH2CF2â€”, â€”CF2CH2â€”, â€”CF&boxH;CFâ€”, â€”CH&boxH;CHâ€”, â€”Câ‰¡Câ€” or a single bond, a is 0, 1 or 2, b is 0, 1 or 2, and c is 0, 1 or 2, where a+b+c is &lE;2.