Patent ID: 7417157

Claim:
A compound of formula I: in which m and n each, independently of one another, are 0, 1 or 2, X 1 , X 2 and X 3 each, independently of one another, denote H, halogen, CN or CF 3 , A 1 and A 2 each, independently of one another, denote 1,4-phenylene, in which ═CH— may be replaced once or twice by ═N— and which may be unsubstituted or mono-to tetrasubstituted, independently of one another, by —CN, —F, —Cl, —Br, —I, unsubstituted or mono- or polyfluorine- and/or -chlorine-substituted C 1 -C 6 -alkanyl, unsubstituted or mono- or polyfluorine- and/or -chlorine-substituted C 1 -C 6 -alkoxy, 1,4-cyclohexylene, 1,4-cyclohexenylene or 1,4-cyclohexadienylene, in which —CH 2 — may be replaced once or twice, independently of one another, by —O— or —S— in such a way that heteroatoms are not linked directly, and which may be unsubstituted or mono- or poly-substituted by —F and/or —Cl, bicyclo[1.1.1]pentane-1,3-diyl, bicyclo[2.2.2]octane-1,4-diyl, spiro[3.3]heptane-2,6-diyl, tetrahydropyran-2,5-diyl or 1,3-dioxane-2,5-diyl; Z 1 and Z 2 each, independently of one another, denote a single bond, —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CF 2 CF 2 —, —CF 2 CH 2 —, —CH 2 CF 2 —, —CHF—CHF—, —(CO)O—, —O(CO)—, —CH 2 O—, —OCH 2 —, —CF═CH—, —CH═CF—, —CF═CF—, —CH═CH— or —C≡C—; R 1 and R 2 , independently of one another, denote hydrogen, an alkanyl, alkoxy, alkenyl or alkynyl radical having up to 15 C atoms, which is unsubstituted, monosubstituted by —CN or —CF 3 or mono- or polysubstituted by —F, —Cl, —Br and/or —I, in which one or more CH 2 groups are optionally each, independently of one another, replaced by —O—, —S—, —SO 2 —, —CO—, —(CO)O—, —O(CO)— or —O—CO—O— in such a way that heteroatoms are not linked directly, —F, —Cl, —Br, —I, —CN, —SCN, —NCS or —SF 5 ; where A 1 , A 2 , Z 1 , Z 2 may each have identical or different meanings if m or n respectively is greater than 1, and where in the case where simultaneously n=0, m=0 and X 1 , X 2 and X 3 are not equal to F, R 1 and R 2 then do not simultaneously denote H.