Polymerisable compounds and the use thereof in liquid-crystal media and liquid-crystal displays

A compound of formula 13

• wherein
• L on each occurrence, identically or differently, denotes F, CI, CN, SCN, SF5 or a straight-chain or branched, in each case optionally fluorinated alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy having 1 to 12 C atoms,
• r denotes 0, 1, 2, 3 or 4, and
• n denotes an integer between 1 and 24;
• or a compound of formula 15
• wherein
• L on each occurrence, identically or differently, denotes F, CI, CN, SCN, SF5 or a straight-chain or branched, in each case optionally fluorinated alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy having 1 to 12 C atoms,
• r denotes 0, 1, 2, 3 or 4, and
• n denotes an integer between 1 and 24;
• or compound (5)
• or of formula I
• Pa—(Spa)s1-A2-Q1-A1-Q2-A3-(Spb)s2—Pb
• in which
• Pa, Pb each, independently of one another, denote a polymerizable group, wherein at least one of Pa and Pb is a methacrylate group,
• Spa, Spb each, independently of one another, denote a spacer group,
• s1,s2 each, independently of one another, denote 0 or 1,
• Q1, Q2 each, independently of one another, denote —CF2O—or —OCF2—,
• A1denotes
• a) trans-1,4-cyclohexylene, 1,4-cyclohexenylene or 1,4′-bicyclohexylene, in which optionally one or more non-adjacent CH2 groups are replaced by —O— and/or —S—, and in which one or more H atoms are optionally replaced by F,
• b1) 1,3-phenylene, in which optionally one or two CH groups are replaced by N and in which one or more H atoms are optionally replaced by L,
• b2) 1,4-phenylene, in which optionally one or two CH groups are replaced by N and in which one or more H atoms are optionally replaced by L, wherein L is not CF2H or CF3,
• c) tetrahydropyran-2,5-diyl, 1,3-dioxane-2,5-diyl, tetrahydrofuran-2, 5-diyl, cyclobut-1,3-diyl, piperidine-1,4-diyl, thiophene-2, 5-diyl or selenophene-2,5-diyl, each of which is optionally mono- or polysubstituted by L,
• d) bicyclo[1.1.1] pentane-1,3-diyl, bicyclo[2.2.2] octane-1,4-diyl, spiro[3.3]-heptane -2,6-diyl,
• wherein one or more H atoms are optionally replaced by L, and/or one or more double bonds are optionally replaced by single bonds, and/or one or more CH groups are optionally replaced by N,
• R0, R00 each, independently of one another, denote H, F or a straight-chain or branched alkyl having 1 to 12 C atoms, in which one or more H atoms are optionally replaced by F,
• M denotes —O—, —S—, —CH2—, —CHY1—or —CY1Y2—,
• Y1 and Y2 each, independently of one another, denote H, F, OCF3, CI, CN or a straight-chain or branched alkyl having 1 to 12 C atoms, in which one or more H atoms are optionally replaced by F,
• A2, A3 each, independently of one another, denote
• a) trans-1,4-cyclohexylene, 1,4-cyclohexenylene or 1,4′-bicyclohexylene, in which optionally one or more non-adjacent CH2 groups are replaced by —O—and/or —S—, and in which one or more H atoms are optionally replaced by F,
• b) 1,4-phenylene or 1,3-phenylene, in which optionally one or two CH groups are replaced by N and in which one or more H atoms are optionally replaced by L,
• c) tetrahydropyran-2,5-diyl, 1,3-dioxane-2,5-diyl, tetrahydrofuran-2,5-diyl, cyclobut-1,3-diyl, piperidine-1,4-diyl, thiophene-2,5-diyl or selenophene-2,5-diyl, each of which is optionally mono- or polysubstituted by L,
• d) a saturated, partially unsaturated or fully unsaturated, and optionally substituted, polycyclic radical having 5 to 20 cyclic C atoms, one or more of which are optionally replaced by heteroatoms,
• and in which
• one or more of A1, A2 and A3 are
• b1) 1,3-phenylene, in which one or two CH groups are optionally replaced by N and in which optionally one or more H atoms are replaced by L,
• or one or more of A2 and A3 are
• d) a saturated, partially unsaturated or fully unsaturated, and optionally substituted, polycyclic radicals having 5 to 20 cyclic C atoms, one or more of which are optionally replaced by heteroatoms,
• or Al is,
• d) bicyclo[1.1.1]pentane-1,3-diyl, bicyclo[2.2.2]octane-1,4diyl, spiro[3.3]heptane-2,6-diyl,
• wherein one or more H atoms are optionally replaced by L, and/or one or more double bonds are optionally replaced by single bonds, and/or one or more CH groups are optionally replaced by N,
• or wherein at least one of the following limitations A) or B) apply
• A) wherein each of Al, A2 and A3 are 1,4-phenylene, in which optionally one or two CH groups are replaced by N and in which one or more H atoms are optionally replaced by L, and wherein L is not CF2H or CF3 for Al,
• B) wherein each of A1, A2 and A3 are 1,4-phenylene, in which one or more H atoms are optionally replaced by L, and wherein L is not CF2H or CF3 for Al,
• L on each occurrence, identically or differently, denotes F, CI, CN, SCN, SF5 or a straight-chain or branched, in each case optionally fluorinated alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy having 1 to 12 C atoms.