Solvent Red 23

Solvent Red 23 Basic information
Product Name:Solvent Red 23
Synonyms:1-[[P-(PHENYLAZO)PHENYL]AZO]-2-NAPHTHOL;1-[4-(PHENYLAZO)PHENYLAZO]-2-NAPHTHOL;SCARLET B;SUDAN RED BK;SUDAN G;SUDAN III STAIN;SOLVENT RED 23;OIL RED O, B OR 3B
CAS:85-86-9
MF:C22H16N4O
MW:352.39
EINECS:201-638-4
Product Categories:Azo;Pharmaceuticals;Solvent Dyestuff;Aromatics;Intermediates & Fine Chemicals;Organics
Mol File:85-86-9.mol
Solvent Red 23 Structure
Solvent Red 23 Chemical Properties
Melting point 199 °C (dec.)(lit.)
Boiling point 486.01°C (rough estimate)
density 1.2266 (rough estimate)
refractive index 1.6620 (estimate)
storage temp. Store at +5°C to +30°C.
solubility Insoluble in water; soluble in benzene, chloroform; moderately soluble in acetone, ether, petroleum ether; slightly soluble in ethanol, xylene
pka13.45±0.50(Predicted)
Colour Index 26100
form Powder
color Red-brown
λmax507 nm, 354 nm
Merck 14,8884
BRN 2016384
Stability:Stable. Incompatible with strong oxidizing agents.
Biological ApplicationsAntiseptic; preventing prostate cancer; medical devices; dental impression materials
InChIKeyFHNINJWBTRXEBC-HXEHWPEMSA-N
LogP5.740 (est)
CAS DataBase Reference85-86-9(CAS DataBase Reference)
IARC3 (Vol. 8, Sup 7) 1987
EPA Substance Registry SystemC.I. Solvent Red 23 (85-86-9)
Safety Information
Hazard Codes Xi
Risk Statements 10-20-36/38-36/37/38
Safety Statements 22-24/25-36-26
WGK Germany 3
RTECS QK4250000
TSCA Yes
HS Code 32129000
Toxicitycyt-ham:ovr 20 mmol/L/5H-C ENMUDM 1,27,79
MSDS Information
ProviderLanguage
Sudan RedEnglish
SigmaAldrichEnglish
ALFAEnglish
Solvent Red 23 Usage And Synthesis
DescriptionSolvent Red 23 is an oil-soluble red azo dye used in cosmetic products in Japan. Cases were reported in hairdressers, who also reacted to PPD and to paminoazobenzene. One case of contact dermatitis was reported in the metal industry.
Chemical Propertiesreddish brown powder
UsesDye. Biological stain.
UsesWeakly acidic azo dye. Biological stain. Dyes and metabolites, Environmental Testing.
UsesWeakly acidic azo dye. Biological stain.
DefinitionChEBI: A bis(azo) compound that is 2-naphthol substituted at position 1 by a 4-{[(2-methylphenyl)diazenyl]phenyl}diazenyl group. A fat-soluble dye predominantly used for demonstrating triglycerides in frozen sections, but which may also stain some protein bound l pids in paraffin sections.
Preparation4-(Phenyldiazenyl)benzenamine diazotization, and Naphthalen-2-ol coupling. Note: some goods by 4-(Phenyldiazenyl)benzenamine and 2-Methyl-4-(o-tolyldiazenyl)benzenamine mixture as diazo components and have to.
Contact allergensSolvent Red 23 is an oil-soluble red azo-dye used in cosmetic products in Japan. Cases were reported in hairdressers, who also reacted to PPD (the molecule is likely to be hydrolyzed into PPD) and to p-aminoazobenzene. One case of contact dermatitis was reported in the metal industry.
Safety ProfilePoison by intraperitoneal route. Moderately toxic by subcutaneous and intrapleural routes. Questionable carcinogen. Mutation data reported. When heated to decomposition it emits toxic fumes of NOx.
Purification MethodsCrystallise the dye from EtOH, EtOH/water or *benzene/absolute EtOH (1:1). [Beilstein 16 II 75, 16 III 148, 16 IV 248.]
Properties and Applicationsyellow red to red. Soluble in ethanol and acetone, soluble in benzene. In concentrated sulfuric acid to blue light green, dilution for blue solution, and a red precipitation.
StandardLight FastnessHeat-resistant(℃)waterSodium Carbonate(5%)Hydrochloric acid(5%)Melting pointStableISOGood19570≥ 120SublimationInsolubleNo changeNo change
Solvent Red 23 Preparation Products And Raw materials
Raw materials4-AMINOAZOBENZENE–>O-AMINOAZOTOLUENE–>2-Naphthol

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