Patent ID: 7922934

Claim:
A 1,2,3,6,7,8-Hexahydro-s-indacene or 6,7-dihydro-5H-indeno[5,6-d]-1,3-dioxole compound of formula I in which R 1 denotes H, halogen, a linear or branched alkyl radical having 1 to 15 C atoms which is unsubstituted, monosubstituted by CN or CF 3 or at least monosubstituted by halogen and in which one or more CH 2 groups may each, independently of one another, be replaced by —O—, —S—, —CO—, —(CO)O—, —CH═CH—, —CH═CF—, —CF═CF— or —C≡C— in such a way that heteroatoms are not linked directly to one another and asymmetrical groups may be present in both orientations, A 1 in each case, independently of one another, identically or differently, denotes a) trans-1,4-cyclohexylene, in which one or more non-adjacent CH 2 groups may be replaced by —S—, tetrahydropyran-2,5-diyl or 1,3-dioxane-2,5-diyl, b) 1,4-phenylene, in which one or two CH groups may be replaced by N and in which one or more H atoms may be replaced by halogen, c) a radical selected from the group consisting of 1,4-bicyclo[2.2.2]octylene, spiro[3.3]heptane-2,6-diyl, cyclobutane-1,3-diyl, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1,2,3,4-tetrahydronaphthalene-2,6-diyl, in which CH may be replaced by N and in which one or more H atoms may be replaced by halogen, or d) 1,4-cyclohexenylene, X denotes —CH 2 —, —CF 2 — or —O—, Y denotes F, Cl, CF 3 , CN, NCS, SCN, SF 5 or 2- to 6-C perfluoroalkyl, Z 1 in each case, independently of one another, in the case of asymmetrical bridging units Z 1 in either of the two orientations, denotes a single bond, —CH 2 O—, —(CO)O—, —CF 2 O—, —CF═CF—, —CH 2 CH 2 CF 2 O—, —CF 2 CF 2 —, —CH 2 CF 2 —, —CH 2 CH 2 —, —CH═CH—, —CH═CF— or —C≡C—, and n denotes 0, 1, 2 or 3.