abstract |
There is disclosed a process for the preparation of a compound of formula (I) wherein W is a -COOR group or CN residue, R 1 is a hydrogen or halogen atom or a (C 1 -C 4) alkyl group, R 3, R 4, R 5, R 6, R7 independently represents a hydrogen or halogen atom or a (C1-C4) alkyl, (C1-C4) alkoxy or trifluoromethyl group and R is a (C1-C4) alkyl or benzyl group. |