2-Amino-4-methyl-6-nitrophenol → 2-Amino-4-Nitrophenol

Participants

Reaction Steps

45.4 Parts of the 1:1 chromium complex (obtained by the known process and containing 1 atom of chromium for each molecule of monoazo dyestuff) of the azo dyestuff from diazotised 6-nitro-4-methyl-2-amino-1-hydroxybenzene and 1-phenyl-3-sulphomethyl-5-pyrazolone are stirred in 1000 parts of hot water together with 33.9 parts of the monoazo dyestuff obtained by the known process from diazotised 4-nitro-2-amino-1-hydroxybenzene. The suspension is adjusted to pH 7 to 8 by addition of 20 parts vy volume of concentrated sodium hydroxide solution and subsequently stirred at 90°-95° C. until both starting dyestuffs can no longer be detected. The unitary chromium mixed complex present in clear solution is precipitated by the addition of sodium chloride, isolated by filtration, washed with sodium chloride solution, and then dried in vacuo. After it has been ground, the dyestuff is in the form of a dark red, readily water-soluble powder from a bath containing ammonium sulphate dyes wool or polyamide fibres in full scarlet shades with good fastness properties. It has the following constitution: ##STR15##

Provenance & Evidence