131-79-3

Basic information

• Product Name: OIL YELLOW OB
• Synonyms: 1-((2-methylphenyl)azo)-2-naphthalenamine;1-(2-methylphenyl)azo-2-naphthalenamine;1-(2-methylphenyl)azo-2-naphthylamine;1-(2-o-tolylazo)-2-naphthylamine;1-(o-tolylazo)-2-naphthylamin;1-(o-tolylazo)-2-naphthylamine;a.f.yellowno.3;c.i.foodyellow11
• CAS NO: 131-79-3
• Molecular Formula: C₁₇H₁₅N₃
• Molecular Weight: 261.32
• EINECS: 205-039-9
• Mol File: 131-79-3.mol
• Article Data: 2

Chemical Properties

• Melting Point: 125-126° (Fischer)
• Boiling Point: 394.58°C (rough estimate)
• Flash Point: 243.3°C
• Appearance: /
• Density: 1.1394 (rough estimate)
• Vapor Pressure: 2.51E-09mmHg at 25°C
• Refractive Index: 1.6360 (estimate)
• CAS DataBase Reference: OIL YELLOW OB(CAS DataBase Reference)
• NIST Chemistry Reference: OIL YELLOW OB(131-79-3)
• EPA Substance Registry System: OIL YELLOW OB(131-79-3)

Safety Data

• Hazardous Substances Data: 131-79-3(Hazardous Substances Data)

Usage

Description

OIL YELLOW OB is a red light yellow to orange colored dye that is soluble in ethanol and toluene, but insoluble in water. It has a melting point of 126℃ and exhibits different colors when dissolved in various substances. It is an orange or yellow powder that is insoluble in water but soluble in alcohol and oils.

Uses

Used in Biological Stain Applications:
OIL YELLOW OB is used as a biological stain for staining purposes due to its color properties and solubility in ethanol and toluene.
Used in Dye Industry:
OIL YELLOW OB is used as a dye in the dye industry for coloring various materials due to its color properties and solubility in alcohol and oils.
Used in Chemical Industry:
OIL YELLOW OB is used as a chemical intermediate in the chemical industry for the synthesis of other compounds due to its chemical properties.
Properties and Applications:
OIL YELLOW OB has good light fastness and heat resistance up to 70℃. It is insoluble in water but soluble in alcohol and oils. It exhibits well solubility in sodium carbonate (5%) and hydrochloric acid (5%).

Preparation

O-Methylaniline diazotization, and Naphthalen-2-amine coupling.

Hazard

Consult regulations before using in food products. Questionable carcinogen.

Safety Profile

A poison by ingestion. Moderately toxic by intraperitoneal and subcutaneous routes. Questionable carcinogen with experimental tumorigenic data. May be contaminated with the carcinogen p-naphthylamine. Mutation data reported. When heated to decomposition it emits toxic fumes of NOx. See also AROMATIC AMINES.

Standard

Light Fastness

Melting point

Stable

ISO

Good

InChI:InChI=1/C17H15N3/c1-12-6-2-5-9-16(12)19-20-17-14-8-4-3-7-13(14)10-11-15(17)18/h2-11H,18H2,1H3/b20-19+

Upstream product

• 91-59-8 naphthalen-2-ylamine 
• 636-21-5 o-toluidine hydrochloride 
• 20893-80-5 naphthalene-2-diazonium chloride 

Downstream Products

• 607-24-9 2-nitro-1-naphthol 
• 111386-87-9 2-o-tolyl-2H-naphtho[1,2-d][1,2,3]triazole 
• 2646-17-5 orange OT 
• 37874-83-2 bis(1-{2-methyl-benzeneazo}-naphthylamine-⁽²⁾)-cobalt(II) 
• 938-25-0 1,2-diaminonaphthalene 
• 95-53-4 o-toluidine 

Relevant articles and documents

Insecticide evaporator comprising a stabilizer

Insecticide evaporator comprising at least one volatile phosphoric ester insecticide, an agent for stabilizing the said ester against decomposition by protonization and used in an amount of 0.2 to 20% based on the weight of phosphoric ester, characterized in that the stabilizing agent contains at least one compound selected from the compounds of the chemical class of 1,3-benzodioxoles and at least one diazene.