Patent ID: 6436489
Filing Date: 2002-08-20
Classification: C07D,C09K

Abstract:
A liquid-crystalline mixture comprising at least one benzothiazole of the formula (I) where the symbols and indices have the following meanings:X1 and X2, independently of one another, are â€”CHâ€”, â€”CFâ€”, the â€”(R1)â€”Câ€” group or the â€”(R1â€”A1â€”M1)Câ€” group Y1and Y2, independently of one another, are hydrogen or fluorine, but are not simultaneously fluorine with the provisos that:x1) X2 is the â€”(R1)Câ€” group or the â€”(R1â€”A1â€”M1)Câ€” group, and X1 is â€”CFâ€”, Y1 is F and Y2 is H, or x2) X1 is the â€”(R1)Câ€” group or the â€”(R1â€”A1â€”M1)Câ€” group, and X2 is â€”CFâ€”, Y2 is F and Y1 is H, or x3) X2 is the â€”(R1)Câ€” group or the â€”(R1â€”A1â€”M1)Câ€” group, and X1 is â€”CHâ€”, Y1 is H and Y2 is F, or x4) X1 is the â€”(R1)Câ€” group or the â€”(R1â€”A1â€”M1)Câ€” group, and X2 is â€”CHâ€”, Y2 is H and Y1 is F, x5) X2 is the â€”(R1)Câ€” group or the â€”(R1â€”A1â€”M1)Câ€” group, and X1 is â€”CHâ€”, Y1 is F and Y2 is H R1 and R2, independently of one another, are a straight-chain or branched alkyl radical (with or without asymmetrical carbon atoms) having 1 to 20 carbon atoms, where a) one or two non-terminal â€”CH2â€” groups may be replaced by â€”Oâ€” and/or â€”C(&boxH;O)â€” and/or â€”Si(CH3)2â€”, with the proviso that two adjacent â€”CH2â€” groups cannot be replaced by heteroatoms, and/or b) one or more â€”CH2â€” groups may be replaced by â€”CH&boxH;CHâ€” and/or â€”Câ‰¡Câ€”, and/or c) one â€”CH2â€” group may be replaced by cyclopropane-1,2-diyl, cyclobutane-1,3-diyl, cyclopentane-1,3-diyl, bi-cyclo[1.1.1]pentane-1,3 -diyl or cyclohexane-1,4-diyl, and/or d) one or more H atoms may be replaced by F, and/or e) in the case of a branched alkyl radical containing asymmetrical carbon atoms, the asymmetrical carbon atoms either have â€”CH3, â€”OCH3, â€”CF3, F, CN and/or Cl as substituents, or are incorporated into a 3- to 7-membered ring, in which, in addition, one or two non-adjacent â€”CH2â€” groups may be replaced by â€”Oâ€” and one â€”CH2â€” group may be replaced by â€”OC(&boxH;O)â€”A1 and A2, independently of one another, are phenylene-1,4-diyl, unsubstituted, monosubstituted or disubstituted by CN or F, phenylene-1,3-diyl, unsubstituted, monosubstituted or disubstituted by CN or F, cyclohexane-1,4-diyl, in which one or two H atoms may be replaced by CN and/or CH3 and/or F, 1-cyclohexene-1,4-diyl, in which one H atom may be replaced by F, 1-alkyl-1-silacyclohexane-1,4-diyl, pyridine-2,5-diyl, unsubstituted or monosubstituted by F, pyrimidine-2,5-diyl, unsubstituted or monosubstituted by F, 1,1â€²-biphenyl-4,4â€²-diyl, unsubstituted, monosubstituted or disubstituted by F, or 1,1â€²-phenylcyclohexyl-4,4â€²-diyl, in which the phenyl moiety is unsubstituted, monosubstituted or disubstituted by F M1 is undirected and is â€”OC(&boxH;O)â€”, â€”OC(&boxH;O)Oâ€”, â€”OCH2â€”, (CH2)nâ€”, â€”OC(&boxH;O)CH2CH2â€”, â€”OCH2CH2CH2â€”, â€”Câ‰¡Câ€” or a single bond n is from 1 to 6.