Patent ID: 7270856

Claim:
Cyclobutane derivatives of the formula I in which R 1 , R 2 are identical or different and each, independently of one another, denote H, halogen (F, Cl, Br or I) or a linear or branched, optionally chiral alkyl or alkoxy radical having 1 to 15 C atoms which is unsubstituted or mono- or polysubstituted by halogen and in which one or more CH 2 groups may each be replaced, independently of one another, by —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O—, —CH═CH—, —CH═CF—, —CF═CF—, —C≡C— or in such a way that heteroatoms are not linked directly to one another, —CN, —SCN, —SF 5 , —SCF 3 , —CF 3 , —CF═CF 2 , —CF 2 CF 2 CF 3 , —OCF 3 , —OCHF 2 , —CF 2 CH 2 CF 3 or —OCH 2 CF 2 CHFCF 3 , A is identical or different and in each case, independently of one another, denotes a) trans-1,4-cyclohexylene, in which, in addition, one or more non-adjacent CH 2 groups may be replaced by —O— and/or —S— and in which, in addition, one or more H atoms may be replaced by F, b) 1,4-phenylene, in which one or two CH groups may be replaced by N and in which, in addition, one or more H atoms may be replaced by halogen (F, Cl, Br or I), —CN, —CH 3 , —CHF 2 , —CH 2 F, —OCH 3 , —OCHF 2 or —OCF 3 , c) a radical from the group bicyclo[1.1.1]pentane-1,3-diyl, bicyclo[2.2.2]octane-1,4-diyl, spiro[3.3]heptane-2,6-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl, 1,2,3,4-tetrahydronaphthalene-2,6-diyl and piperidine-1,4-diyl, or d) 1,4-cyclohexenylene, Z is identical or different and in each case, independently of one another, denotes —O—, —CH 2 O—, —OCH 2 —, —CO—O—, —O—CO—, —CF 2 O—, —OCF 2 —, —CF 2 CF 2 —, —CH 2 CF 2 —, —CF 2 CH 2 —, —CH 2 CH 2 —, —CH═CH—, —CH═CF—, —CF═CH—, —CF═CF—, —CF═CF—COO—, —O—CO—CF═CF—, —C≡C— or a single bond, m, n are identical or different and, independently of one another, denote 0, 1 or 2, and o denotes 0 or 1.