C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
260/173.5
C09B 29/00 (2006.01) C09B 43/42 (2006.01)
Patent
CA 1041487
PROCESS FOR THE PREPARATION OF AZO DYESTUFFS CONTAINING NITRILE GROUPS Absract The invention relates to the preparation of ortho-cyano azo dyestuffs by conversion of azo dyestuffs of the formula Image wherein A is an aromatic-carbocyclic radical, K is the radical of a component and X is a chlorine, bromine or iodine atom which is in the o-position to the azo group with CuCN or CuCN-forming compounds in polar organic sovents in the presence of azoles.
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