Process for the preparation of cyanoazo dyestuffs

Details Process for the preparation of cyanoazo dyestuffs Process for the preparation of cyanoazo dyestuffs

C - Chemistry, Metallurgy

09

B

260/155

C09B 29/00 (2006.01) C09B 43/42 (2006.01)

Patent

CA 1058164

Process for the preparation of cyanoazo dyestuffs Abstract The invention relates to the preparation of o-cyanoazo dyestuffs by reaction of corresponding o-halogenoazo dyestuffs with zinc compounds of the formula Image wherein Me represents an alkali metal and m represents the numbers 0,1 or 2 in the presence of small amounts of copper-I compounds. The improvement of this process as compared with the well- known CuCN-method consists in that practically metalfree dyestuffs are obtained and - moreover-that it is cheaper than the conventional process.

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