Substituted polyphenyls

A compound of formula I,

• which includes a biphenyl moiety of the formula A
• in which
• L independently denotes F, Cl, —CN, an alkyl group having 1 to 5 C atoms, an alkoxy group having 1 to 5 C atoms or an alkenyl group having 1 to 5 C atoms,
• a, b, c, d, e, independently of one another, denote 0, 1 or 2,
• where a+b+c+d+e>0,
• R1 and R2, independently of one another, denote
• a) an alkyl group having 1 to 15 C atoms, which may optionally be monosubstituted by CN or at least monosubstituted by halogen, where in each case one or more CH2 groups, in each case independently of one another, may also be replaced by —CH═CH—, —CF═CF—, —CF═CH—, —CH═CF— or —C≡C—,
• b) F, Cl, —CN, —NCS, —SF5, —CF3, —CHF2, —CH2F, —OCF3, —OCHF2, —OCH2F,
• c) a radical of the formula
• in which R0 is defined as R1 above,
• or
• d) a polymerisable group.