Patent ID: 7514127

Claim:
A compound of formula I: in which: m and n are each, independently of one another, 0, 1, 2 or 3; Y denotes O, S, S(O), SO 2 , CH 2 , CF 2 , CCl 2 , CHF, CHCl, CFCl, C(CF 3 ) 2 , CHCF 3 , C(CN) 2 or CHCN; X 1 , X 2 and X 3 each, independently of one another, denote H, halogen, CN, SCN, NCS or SF 5 ; A 1 and A 2 each, independently of one another, denote 1,4-phenylene, in which ═CH— may be replaced once or twice by ═N— and which may be unsubstituted or mono- to tetrasubstituted, independently of one another, by —CN, —F, —Cl, —Br, —I, C 1 -C 6 -alkanyl which is unsubstituted or mono- or polysubstituted by fluorine and/or chlorine or by C 1 -C 6 -alkoxy which is unsubstituted or mono- or polysubstituted by fluorine and/or chlorine, 1,4-cyclohexylene, 1,4-cyclohexenylene or 1,4-cyclohexadienylene, in which —CH 2 — may be replaced once or twice, independently of one another, by —O— or —S— in such a way that hetero atoms are not linked directly, and which may be unsubstituted or mono- or polysubstituted by —F, —Cl, —Br and/or —I; Z 1 and Z 2 each, independently of one another, denote a single bond, a double bond, —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CF 2 CF 2 —, —CF 2 CH 2 —, —CH 2 CF 2 —, —CHF—CHF—, —C(O)O—, —OC(O)—, —CH 2 O—, —OCH 2 —, —CF═CH—, —CH═CF—, —CF═CF—, —CH═CH— or —C═C—; R 1 and R 2 denote an alkyl, alkoxy, alkenyl or alkynyl radical having 1 to 15 or 2 to 15 C atoms respectively which is unsubstituted, monosubstituted by —CN or —CF 3 or monosubstituted or polysubstituted by F, Cl, Br and/or I, where, in addition, one or more CH 2 groups in these radicals may each, independently of one another, be replaced by —O—, —S—, —SO 2 —, —CO—, —COO—, —OCO— or —OCO—O— in such a way that hetero atoms are not linked directly, —F, —Cl, —Br, —I, —CN, —SCN, —NCS or —SF 5 ; where A 1 , A 2 , Z 1 , Z 2 , R 1 and R 2 may each have identical or different meanings if m or n is greater than 1; and where, in the case where m and n are both zero, R 1 and R 2 are each, independently of one another, an unbranched alkyl radical, alkoxy radical or alkenyl radical having 1 to 7 or 2 to 7 carbon atoms respectively.