| 摘要 |
The invention relates to the preparation of o-cyanoazo dyestuffs by reaction of corresponding o-halogenoazo dyestuffs with zinc compounds of the formula MemZn(CN)2+m 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.
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