Process for the preparation of pyrazoline compounds

摘要

There is described a process for the preparation of pyrazoline compounds of the formula I <IMAGE> in which A1 denotes an optionally substituted alkylene radical. The process consists in the corresponding "alkylation" of the metal salt of the corresponding 1-sulphinophenylpyrazoline compound. Corresponding quaternary compounds can be obtained by further N-alkylation of the terminal amino group. The final substances obtained are used as optical brighteners of non-textile materials.