Patent ID: 7998541

Claim:
A dielectrically positive compound of formula I in which G denotes —CO—O—, —CH 2 —O—, —CF 2 —O—, —O—CO—, —O—CH 2 — or —O—CF 2 —, each, independently of one another and, if present more than once, also these independently of one another, denote (a) 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—, (b) a 1,4-cyclohexenylene radical, (c) a 1,4-phenylene radical, in which, in addition, one or two non-adjacent CH groups may be replaced by N, or (d) naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1,2,3,4-tetrahydronaphthalene-2,6-diyl, (e) a radical selected from the group 1,4-bicyclo[2.2.2]octylene, 1,3-bicyclo[1.1.1]pentylene, spiro[3.3]heptane-2,6-diyl and 1,3-cyclobutylene, where in (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, L 1 to L 3 each, independently of one another, denote H, halogen, —CN or —CF 3 , denotes a 1,4-trans-cyclohexane-1,2,4-triyl radical, which may optionally contain one, two or three C—C double bonds, R 1 and R 2 each, independently of one another, denote alkyl or alkoxy having 1 to 15 C atoms, alkoxyalkyl, alkenyl or alkenyloxy having 2 to 15 C atoms, alkynyl or alkynyloxy having 2 to 15 C atoms, H, halogen, —CN, —SCN, —NCS, —OCN, —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, and one of R 1 or R 2 is halogen, —CN, —SCN, —NCS, —OCN, —SF 5 , —CF 3 , —CHF 2 , —CH 2 F, —OCF 3 , or —OCHF 2 , Z 1 and Z 2 each, independently of one another and, if present more than once, also these independently of one another, denote —CH 2 —CH 2 —, —(CH 2 ) 4 —, —CF 2 —CF 2 —, —CF 2 —CH 2 —, —CH 2 —CF 2 —, —CH═CH—, —CF═CF—, —CF═CH—, —CH═CF—, —C≡C—, —CO—O—, —O—CO—, —CH 2 —O—, —O—CH 2 —, —CF 2 —O—, —O—CF 2 —, or a combination of two of these groups, where no two O atoms are bonded to one another, n and m each denote 0, 1 or 2, where n+m denotes 0, 1, 2 or 3.