Preparation of azo dyestuffs

Details Preparation of azo dyestuffs Preparation of azo dyestuffs

C - Chemistry, Metallurgy

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C09B 29/00 (2006.01) C09B 29/08 (2006.01) C09B 29/40 (2006.01) C09B 31/00 (2006.01) C09B 31/02 (2006.01) C09B 41/00 (2006.01)

Patent

CA 1095898

Ref. 3056 PREPARATION OF AZO DYES Abstract of the Disclosure Azo dyes are very simply made in high purity and very good yield by coupling a diazonium compound with a coupling compound in a mixture essentially of water with a simple alkanol having four to six carbons and soluble in water to the extent of not over about 15% by weight at 15°C. This procedure is particularly effective with compounds that are ordinarily difficult to couple.

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