Patent ID: 7182885

Claim:
An indene compound of formula (I) having a negative dielectric anisotropy: wherein: T is in each case, independently of one another, A is in each case, independently of one another, 1,4-phenylene, in which one or two ═CH— groups are each, optionally, replaced by ═N—, and which is unsubstituted or monosubstituted to tetrasubstituted, independently of one another, by halogen, —CN, —CH 3 , —CH 2 F, —CHF 2 , —CF 3 , —OCH 3 , —OCH 2 F, —OCHF 2 or —OCF 3 , or is 1,4-cyclohexylene, 1,4-cyclohexenylene or 1,4-cyclohexadienylene, in which one or two —CH 2 — groups are each, optionally, independently of one another, replaced by —O— or —S—, and which is unsubstituted or mono- or polysubstituted by halogen; R is in each case, independently of one another, hydrogen, or is alkyl having 1 to 15 carbon atoms, alkoxy having 1 to 15 carbon atoms, alkenyl having 2 to 15 carbon atoms or alkynyl having 2 to 15 carbon atoms, which in each case is unsubstituted, monosubstituted by —CF 3 or at least monosubstituted by halogen, an wherein one or more CH 2 groups are, optionally, each, independently of one another, replaced by —O—, —S—, —CO—, —COO—, —OCO— or —OCO—O— in such a way that heteroatoms are not directly adjacent, or is halogen, —CN, —SCN, —NCS, —SF 5 , —CF 3 , —OCF 3 , —OCHF 2 or —OCH 2 F; L is hydrogen or halogen; X is hydrogen, or is alkyl having 1 to 15 carbon atoms, alkoxy having 1 to 15 carbon atoms, alkenyl having 2 to 15 carbon atoms or alkynyl having 2 to 15 carbon atoms, which in each case is unsubstituted, monosubstituted by —CF 3 or at least monosubstituted by halogen, and wherein one or more CH 2 groups are, optionally, each, independently of one another, replaced by —O—, —S—, —CO—, —COO—, —OCO— or —OCO—O— in such a way that heteroatoms are not directly adjacent, or is halogen, —CN, —SCN or —NCS; Y, U and W, independently of one another, are each hydrogen, or are alkyl having 1 to 15 carbon atoms, alkoxy having 1 to 15 carbon atoms, alkenyl having 2 to 15 carbon atoms or alkynyl having 2 to 15 carbon atoms, which in each case is unsubstituted, monosubstituted by —CF 3 or at least monosubstituted by halogen, and wherein one or more CH 2 groups are, optionally, each, independently of one another, replaced by —O—, —S—, —CO—, —COO—, —OCO— or —OCO—O— in such a way that heteroatoms are not directly adjacent; Z is in each case, independently of one another, a single bond, —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CF 2 CF 2 —, —C(O)O—, —OC(O)—, —CH 2 O—, —OCH 2 —, —CF═CH—, —CH═CF—, —CF═CF—, —CH═CH— or —C≡C—; n is 0, 1, 2 or 3, p and q, independently of one another, are 0, 1, 2 or 3, wherein n+p+q is 1–9.