Compounds for optically active devices

A compound of formula (I′):

• wherein
• X is O, S or NR0,
• Y is independently of each other O, S or a bond,
• —[B]— is selected from formula (1) to formula (4),
• X1, X2, X3, X4 are each independently of each other CR′ or N,
• X5 is each independently O, S, C═O or NR0,
• X6, X7 are each independently CR′ or N,
• R is at each occurrence independently H, a linear or branched alkyl group having 1 to 10 C atoms, or a cycloalkyl group having 3 to 6 C atoms,
• R′ is at each occurrence independently H, F, a linear or branched, non-halogenated, partially or completely halogenated alkyl group having 1 to 20 C atoms, a linear or branched hydroxyalkyl group having 1 to 20 C atoms, a non-halogenated, partially or completely halogenated cycloalkyl group having 3 to 6 C atoms, a linear or branched, non-halogenated, partially or completely halogenated alkoxy group having 1 to 20 C atoms, or a linear or branched, non-halogenated, partially or completely halogenated thioalkyl group having 1 to 20 C atoms,
• R0 is at each occurrence independently a linear or branched alkyl group having 1 to 10 C atoms or a cycloalkyl group having 3 to 6 C atoms,
• R1 is a polymerizable group selected from:
• an alkenyl group of formula (5),
• wherein
• X10 is O, S, C(═O), or C(═O)O,
• R8, R9, R10 are at each occurrence independently of each other selected from H, F, a linear or branched, non-fluorinated, partially or completely fluorinated alkyl having 1 to 20 C atoms or aryl with 6 to 14 C atoms, and
• c is 0 or 1;
• trialkoxysilyl groups or dialkoxyalkylsilyl groups where the alkyl and/or alkoxy groups are each independently linear or branched having 1 to 6 C atoms;
• and
• silyl groups of formula (6), (7) or (8),
• where alkyl means at each occurrence independently of each other a linear or branched alkyl group having 1 to 6 C atoms and the asterisk “*” denotes at each occurrence independently of each other a linkage to the linker [-R2-Y]n and/or [Y-R2]m,
• R2— is —(C(R)2)o— or —(C(R)2)p—X8—(C(R)2)q—(X9)s—(C(R)2)r—;
• o is 1 to 20,
• X8, X9 are at each occurrence independently O, S or NR0,
• s is 0 or 1,
• p, q are at each occurrence independently 1 to 10,
• r is at each occurrence independently 0 to 10, wherein the overall number of atoms for —(C(R)2)p—X8—(C(R)2)q—(X9)s—(C(R)2)r— is up to 20 atoms,
• R3, R4, R5, R6 are at each occurrence independently R′,
• R7 is R′.