Patent ID: 8029696

Claim:
A fused naphthalene of the formula I in which A 1 ,A 2 ,A 3 ,A 4 each, independently of one another, denote a 1,4-cyclohexylene, 1,4-cyclohexenylene or 1,4-cyclohexadienylene radical which is unsubstituted or substituted by one to four F atoms and in which one or two CH 2 groups may each, independently of one another, be replaced by —O— or —S— in such a way that heteroatoms are not linked directly to one another, a 1,4-phenylene radical, which may be substituted by one or two fluorine or chlorine atoms and in which, in addition, one or two CH groups may be replaced by N, or denote a 1,4-bicyclo[2.2.2]octylene radical or a 2,6-spiro[3.3]heptylene radical, Q 1 -Q 2 denotes O—CH 2 , or O—CF 2 , G 1 -G 2 denotes CH 2 —CH, CF 2 —CH, CH═C, CF═C, R 1 ,R 2 each, independently of one another, denote an alkyl radical having 1 to 12 C atoms which is unsubstituted or at least monosubstituted by halogen and in which one or more non-adjacent CH 2 groups may each, independently of one another, be replaced by —O—, —S—, —CO—, two adjacent CH 2 groups may each be replaced by —CH═CH—, —CF═CF—, —COO—, —OOC—, —C≡C—, a 1,2-cyclopropanylene radical, which may also be substituted by two F atoms, or three adjacent CH 2 groups may be replaced by a 1,3-cyclobutanylene radical, which may also be substituted by two F atoms, or denote F, Cl, —OCF 3 , —OCHF 2 , —CN, —NCS or H, with the proviso that either only R 1 or only R 2 can be H, X 1 ,X 2 ,X 3 , X 4 ,X 5 each, independently of one another, denote H, F or Cl, Z 1 ,Z 2 ,Z 3 ,Z 4 each, independently of one another, denote the single bond, —CH 2 CH 2 —, —CH 2 O—, —OCH 2 —, —CH 2 CF 2 —, —CF 2 CH 2 —, —CH 2 CHF—, —CHFCH 2 —, —CF 2 O—, —OCF 2 —, —COO—, —OOC—, —CH═CH—, —CF═CF—, —C≡C—, and q,r,s,t each, independently of one another, denote 0 or 1.