| abstract |
The present invention relates to formulas (3) and (1), wherein n is 0 or 1, R 13 and R 14 are the same or different and are NHR 310 , NR 311 R 312 , OR 313 , SR 314 and R 315 are selected, or R 13 and R 14 together are selected from the group consisting of (a), (b) and (c), And X provide a process for the preparation of compounds of formula (3), including compounds of which Cl, Br or I are assumed to be as well as compounds of formula (1) as basic intermediates. |