Patent ID: 7029730

Claim:
A compound of the formula I R 1 -(-A 1 -Z 1 -) k1 -Q-CF 2 O-A 2 -(-Z 3 -A 3 -) k3 -R 2 I in which Q is the group, W 1 and W 2 , independently of one another, are —CH 2 — and/ or —O—, X 1 , X 2 , X 3 and X 4 , independently of one another, are H, F, —CH 3 , —CH 2 F, —CHF 2 and/or —CF 3 , with the proviso that at least one substituent X 1 , X 2 , X 3 and/or X 4 is not H, Z 2 is a single bond, —CH 2 —CH 2 — or —CF 2 —CF 2 —, m is 0 or 1, A 1 , A 2 and A 3 , independently of one another, are a) a trans-1,4-cyclohexylene radical, in which one or more non-adjacent CH 2 groups are optionally replaced by —O— and/or —S—, b) a 1,4-phenylene radical, in which one or two CH groups are optionally replaced by N, c) a radical selected from the group consisting of 1,4-bicyclo[2.2.2]-octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1,2,3,4-tetrahydronaphthalene-2,6-diyl, d) 1,4-cyclohexenylene, where the radicals a), b) and d) are optionally substituted by CN, Cl or F, Z 1 and Z 3 are each, independently of one another, —CO—O—, —O—CO—, —O—, —CH 2 —O—, —CF 2 —O—, —O—CH 2 —, —O—CF 2 —, —C 2 H 4 —, —CH 2 —CF 2 —, —CF 2 —CH 2 —, —CF 2 —CF 2 —, —CH═CH—, —CF═CH—, —CH═CF—, —CF═CF—, —C≡C— or a single bond, R 1 and R 2 , independently of one another, are H, halogen, —CN, —NCS, —SF 5 or alkyl having from 1 to 12 carbon atoms, in which one or two non-adjacent —CH 2 — groups are optionally replaced by —O—, —S—, —CO—, —O—CO—, —CO—O—, —E— and/or —C≡C— and/or in which, one or more H atoms are optionally replaced by halogen and/or —CN, E is CR 4 ═CR 5 or CHR 4 —CHR 5 , R 4 and R 5 are each, independently of one another, H, alkyl having 1–6 carbon atoms, F, Cl, CF 3 or CN, k1 and k3, independently of one another, are 0, 1 or 2.