Patent ID: 8609714

Claim:
A compound of formulae I1 to I6: in which R 1 denotes H, a halogenated or unsubstituted alkyl radical having 1 to 15 C atoms, where, in addition, one or more CH 2 groups in these radicals are each optionally replaced, independently of one another, by —C≡C—, —CH═CH—, —(CO)O—, —O(CO)—, —(CO)— or —O— in such a way that O atoms are not linked directly to one another, and where R 2 can additionally denote F, Cl, Br, CN, SCN, NCS or SF 5 , X denotes F, OCF 3 , CN, CF 3 , SCN, SF 5 , NCS, Cl, OCHF 2 , OCHFCF 3 , or OCF 2 CHFCF 3 , and L 2 , L 3 , L 4 , L 5 L 6 , L 7 and L 8 independently of one another, denote H or F,