| abstract |
The invention relates to a process for preparing a compound of formula (I) n n n wherein n a compound of formula (II), n n n wherein n R 1 denotes chlorine, bromine, iodine, —O—COCH 3 , tosylate or mesylate, n is reacted with a compound of formula (III), n n n optionally in a suitable diluent and/or in the presence of a suitable added reagent or catalyst, n the reaction being carried out in a temperature range from 20 to 80° C. |