Process for preparing diazonium salts of 3-amino-pyrazole

Details Process for preparing diazonium salts of 3-amino-pyrazole Process for preparing diazonium salts of 3-amino-pyrazole

C - Chemistry, Metallurgy

07

D

260/179

C07D 231/38 (2006.01)

Patent

CA 1127634

ABSTRACT OF THE DISCLOSURE: The invention is concerned with the preparation of 3-diazonium salts of pyrazole, useful as intermediates in the preparation of azo dyes and which are obtained by an oxidative diazotization of 3-amino-pyrazolines with nitrous acid or with nitrosyl-sulphuric acid. The 3-diazonium salts of pyrazole according to the present invention have the following structure: (I) Image wherein: X is a radical -CO- or -COO-, n is 0 or 1, R is hydrogen (in such case n is always 0), a normal or ramified alkyl C1-C4, an aromatic or hetero- cyclic, optionally substituted, radical, in par- ticular a phenyl radical having the structure: Image in which m may vary from 0 to 3 and substituents R3, either like or unlike one another for m > 1, are alkyls C1-C4 with linear or amified chain, halogens, a cyano, nitro, sulphonic or carboxylic group, car- boxyesters having a linear or ramified chain C1-C4, alkoxyls having a linear or ramified chain C1-C4, trifluoro-methyl groups, acylamino groups having a linear or ramified aliphatic chain C1-C4, or sulphonamide groups of the type Image , wherein substituents R4 and R5, like or unlike each other, are hydrogen, or linear or ramified aliphatic chains C1-C4, and R1 and R2, either like or unlike each other, are hydrogen, linear or ramified aliphatic chains C1-C4, or non-substituted.

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