Patent ID: 7824745

Claim:
A compound of formula I in which Y denotes CF 2 —, L denotes H, halogen or —CF 3 , each, independently of one another and, if present more than once, also these independently of one another, denote a trans-1,4-cyclohexylene radical, in which, in addition, one or two non-adjacent CH 2 groups may be replaced by —O— and/or —S—, a 1,4-cyclohexenylene radical, a 1,4-phenylene radical, in which, in addition, one or two non-adjacent CH groups may be replaced by N, or naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1,2,3,4-tetrahydronaphthalene-2,6-diyl, 1,4-bicyclo[2.2.2]octylene, 1,3-bicyclo[1.1.1]pentylene or spiro-[3.3]heptane-2,6-diyl, wherein (a) and (b), one or more —CH 2 — groups, independently of one another, may each be replaced by a —CHF— or —CF 2 — group, and in (c) and (d), one or more —CH═ groups, independently of one another, may each be replaced by a —CF═, —C(CN)═, —C(CH 3 )═, —C(CH 2 F)═, —C(CHF 2 )═, —C(O—CH 3 )═, —C(O—CHF 2 )═or —C(O—CF 3 )═ group, denotes a 1,4-trans-cyclohexane-1,2,4-triyl radical, in which, in addition, one or more —CH 2 —groups, in each case independently of one another, may each be replaced by a —CHF—or —CF 2 —group, and the —CH< group may be replaced by a —CF< group, and which may optionally contain one or two C—C double bonds, where, in this case, one or more —CH═ groups, independently of one another, may each be replaced by a —CF═, —C(CN)═, —C(CH 3 )═, —C(CH 2 F)═, —C(CHF 2 )═, —C(O—CH 3 )═, —C(O—CHF 2 )═ or —C(O—CF 3 )═ group, R 1 and R 2 each, independently of one another, denote H, halogen, —CN, —SCN, —SF 5 , —CF 3 , —CHF 2 , —CH 2 F, —OCF 3 , —OCHF 2 , an alkyl group having 1 to 15 C atoms which is monosubstituted by CN or CF 3 or at least monosubstituted by halogen, where, in addition, one or more CH 2 groups, in each case independently of one another, may be replaced by —O—, —S—, —CH═CH—, —CF═CF—, —CF═CH—, —CH═CF—, —CO—,—CO—O—,—O—CO— or —O—CO—O—in such a way that neither O nor S atoms are linked directly to one another, Z 1 and Z 2 each, independently of one another, denote —CH 2 —CH 2 —, —CF 2 —CF 2 —, —CF 2 —CH 2 —, —CH 2 —CF 2 —, —CH═CH—, —CF═CF—, —CF═CH—, —CH═CF—, —C≡C—, —COO—, —OCO—, —CH 2 O—, —OCH 2 —, —CF 2 O—, —OCF 2 —, or a combination of two of these groups, where no two O atoms are bonded to one another, and n and m each denote 0, 1 or 2, where n +m denotes 0, 1, 2 or 3.