Patent ID: 7288663

Claim:
Process for preparing compounds of the formula (I), where n is an integer from 2 to 5, R 1 is H or a C 1 -C 20 -alkyl group optionally interrupted by one or more O or S atoms, silylene, phosphonoyl or phosphoryl groups and Ar is substituted or unsubstituted 1,4-phenylene, 2,7-fluorene or 2,5-thiophene, with Ar being able to be identical or different, comprising completely dissolving compounds of the formula (II), where n, R 1 and Ar are as defined for the formula (I), in an organic solvent or solvent mixture at a temperature of from −100° C. to +20° C. and coupling with one another at temperatures of from −100° C. to +20° C. with the aid of one or more copper(II) compound(s).