Simov, D. published the artcileAzo dye from 10-methyl-2-aminophenothiazine, Safety of 1-(2-Chlorophenyl)-3-methyl-5-pyrazolone, the publication is Godishnik na Sofiiskiya Universitet Sv. Kliment Okhridski, Khimicheski Fakultet (1975), 543-54, database is CAplus.
Azo dyes (I, R = pyrazolone, hydroxynaphthalene, aniline, aminonaphthalene residues) were prepared by coupling diazotized 2-amino-10-methylphenothiazine [2031-24-5] with RH and dyed protein and synthetic fibers wetfast and, in some cases, lightfast shades. All dyes were characterized by elementary anal., m.p., visible, uv, and ir spectra, and Rf. In I where R is not a pyrazolone residue the equilibrium between the azo enol form and the quinone hydrazone form is fully shifted to the azo enol form.
Godishnik na Sofiiskiya Universitet Sv. Kliment Okhridski, Khimicheski Fakultet published new progress about 14580-22-4. 14580-22-4 belongs to pyrazoles-derivatives, auxiliary class Organic Pigment, name is 1-(2-Chlorophenyl)-3-methyl-5-pyrazolone, and the molecular formula is C8H17Br, Safety of 1-(2-Chlorophenyl)-3-methyl-5-pyrazolone.
Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics