CF2O-bridged, axially substituted cyclohexane derivatives

A compound of the formula I

• R1-(-A1-Z1-)k1-Q-CF2O-A2-(-Z3-A3-)k3-R2 I
• in which
• Q is the
• group,
• W1 and W2, independently of one another, are —CH2— and/ or —O—,
• X1, X2, X3 and X4, independently of one another, are H, F, —CH3, —CH2F, —CHF2 and/or —CF3, with the proviso that at least one substituent X1, X2, X3 and/or X4 is not H,
• Z2 is a single bond, —CH2—CH2— or —CF2—CF2—,
• m is 0 or 1,
• A1, A2 and A3, independently of one another, are
• a) a trans-1,4-cyclohexylene radical, in which one or more non-adjacent CH2 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,
• Z1 and Z3 are each, independently of one another, —CO—O—, —O—CO—, —O—, —CH2—O—, —CF2—O—, —O—CH2—, —O—CF2—, —C2H4—, —CH2—CF2—, —CF2—CH2—, —CF2—CF2—, —CH═CH—, —CF═CH—, —CH═CF—, —CF═CF—, —C≡C— or a single bond,
• R1 and R2, independently of one another, are H, halogen, —CN, —NCS, —SF5 or alkyl having from 1 to 12 carbon atoms, in which one or two non-adjacent —CH2— 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 CR4═CR5 or CHR4—CHR5,
• R4 and R5 are each, independently of one another, H, alkyl having 1–6 carbon atoms, F, Cl, CF3 or CN,
• k1 and k3, independently of one another, are 0, 1 or 2.