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1 - p - (p1 - tert. - Butylphenoxy) - phenyl - 3 - methyl - 1 - p - hydroxybenzeneazo - 5 - pyrazolone is prepared by coupling diazotized p-hydroxy-aniline with 1 - (p - (p - tert. - butylphenoxy) - phenyl) - 3 - methyl - 5 - pyrazolone in alkaline solution. Mono-azo dyes are also formed by coupling diazotized aniline or a diazotized aminophenol, aminobenzenesulphonic acid, aminobenzenesulphonamide, N : N-dimethylphenylene-diamine, monoacetylphenylenediamine, nitraniline, or aminobenzoic acid with 1-phenyl-3-methyl-5-pyrazolone; by coupling diazotized aniline with 1 : 3-indanedione, 2-ethyl-tetrahydro-1 : 3-diketoisoquinoline, 2 : 3-dihydro-3-ketoindole, or 1-ethyl-oxindole; by coupling diazotized p-nitraniline with 2-thionaphthenone; by coupling diazotized p-n-amyloxyaniline with 1-phenyl-3-benzamido-5-pyrazolone; by coupling diazotized monoacetyl-p-phenylenediamine with 1 - phenyl - 3 - n - pentadecyl-5-pyrazolone; and by coupling diazotized 1-phenyl-2 : 3-dimethyl-4-amino-5-pyrazolone with 1-p-(p1-tert.-butylphenoxy)-phenyl-3-methyl-5-pyrazolone. P - tert. - butylphenoxyphenylhydrazine is prepared by reacting sodium p-tert.-butylphenolate with p-chloronitrobenzene, reducing the nitro group to an amino group and diazotizing, and reducing the diazonium compound. 1 - (P - (p1 - tert. - butylphenoxy) - phenyl) - 3 - methyl-5-pyrazolone is prepared by reacting p-tert.-butylphenoxyphenylhydrazine with ethyl acetoacetate.