Process for the preparation of ring compounds

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, —CH2—CH2—, —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, NO2, NO, CHO, COOH, COOR, CONH2, CONHR, CONR2, CF3, NH2, NHR or NR2,
• 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
• R1 and R2, 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.