Patent ID: 7411100

Claim:
A ring compound formula XIII: wherein m and n are each 1, Y is a group selected from formulae XIV to XVII wherein one or two CH groups in the aromatic ring systems may be replaced by N, X is a single bond, —CH 2 —CH 2 —, —CH═CH—, —C≡C— or L, independently of one another, are identical or different and are R, F, Br, I, OH, OR, SH, SR, CN, NO 2 , NO, CHO, COOH, COOR, CONH 2 , CONHR, CONR 2 , CF 3 , NH 2 , NHR or NR 2 , R is an alkyl, alkenyl or acyl group having from 1 to 12 carbon atoms or an aryl group having 6 carbon atoms, which is optionally substituted by an alkyl group having from 1 to 12 carbon atoms, a, b, c, d, e and f, independently of one another, are identical or different and are 0, 1 or 2, and the sum (a+b+c+d+e+f) is 3 to 8, and R 1 and R 2 , independently of one another, are identical or different and are H, F, Cl, CN, NCS, 2-oxapropyl, 2- or 3-oxabutyl, 2-, 3- or 4-oxapentyl, 2-, 3-, 4- or 5-oxahexyl, 2-, 3-, 4-, 5- or 6-oxaheptyl, 2-, 3-, 4-, 5-, 6- or 7-oxaoctyl, 2-, 3-, 4-, 5-, 6-, 7- or 8-oxanonyl, 2-, 3-, 4-, 5-, 6-, 7-, 8- or 9-oxadecyl, a straight-chain or branched, optionally chiral, alkyl radical or alkoxy radical having from 1 to 12 carbon atoms or an alkenyl radical or alkynyl radical having from 2 to 8 carbon atoms.