138-28-3

Basic information

• Product Name: 3-METHOXY-4-AMINO AZO BENZENE-3'-SULFONIC ACID
• Synonyms: 3-METHOXY-4-AMINO AZO BENZENE-3'-SULFONIC ACID;4-AMINO-3-METHOXYPHENYLAZOBENZENE SULFONIC ACID;3-[(4-amino-3-methoxyphenyl)azo]-benzenesulfonicaci;3-[(4-amino-3-methoxyphenyl)azo]-Benzenesulfonicacid;m-[(4-amino-3-methoxyphenyl)azo]benzenesulphonic acid;3-(4-azanyl-3-methoxy-phenyl)diazenylbenzenesulfonic acid
• CAS NO: 138-28-3
• Molecular Formula: C₁₃H₁₃N₃O₄S
• Molecular Weight: 307.33
• EINECS: 205-321-1
• Mol File: 138-28-3.mol
• Article Data: 2

Chemical Properties

• Appearance: /
• Density: 1.43 g/cm³
• Refractive Index: 1.639
• PKA: -0.98±0.30(Predicted)
• CAS DataBase Reference: 3-METHOXY-4-AMINO AZO BENZENE-3'-SULFONIC ACID(CAS DataBase Reference)
• NIST Chemistry Reference: 3-METHOXY-4-AMINO AZO BENZENE-3'-SULFONIC ACID(138-28-3)
• EPA Substance Registry System: 3-METHOXY-4-AMINO AZO BENZENE-3'-SULFONIC ACID(138-28-3)

Safety Data

• Hazardous Substances Data: 138-28-3(Hazardous Substances Data)

Usage

General Description

3-Methoxy-4-amino azo benzene-3'-sulfonic acid is a chemical compound with the molecular formula C13H13N3O5S. It is commonly used in the synthesis of dyes, pigments, and other organic compounds. This chemical is a monoazo dye that is often used as a pH indicator, as it changes color in different pH environments. It is also used in the production of color photographs and in the textile industry for dyeing fabrics. Additionally, 3-Methoxy-4-amino azo benzene-3'-sulfonic acid is employed in the pharmaceutical industry as an intermediate in the synthesis of various medications. It is important to handle this chemical with care, as it may have harmful effects on human health and the environment if not properly managed.

InChI:InChI=1/C13H13N3O4S/c1-20-13-8-10(5-6-12(13)14)16-15-9-3-2-4-11(7-9)21(17,18)19/h2-8H,14H2,1H3,(H,17,18,19)/b16-15+

Upstream product

• 76008-69-0 (2-methoxy-phenyl)-amidosulfuric acid 
• 17405-03-7 3-Sulfo-benzoldiazoniumchlorid 
• 90-04-0 2-methoxy-phenylamine 

Downstream Products

• 912617-45-9 C₃₃H₃₄N₁₀O₁₄S₄ 
• 947227-65-8 C₁₆H₁₂Cl₂N₆O₄S 
• 947180-12-3 C₁₆H₁₁Cl₂N₆O₄S^(1-)*Na⁽¹⁺⁾ 

Relevant articles and documents

WATER-SOLUBLE AZO COMPOUNDS OR SALTS THEREOF, INK COMPOSITIONS AND COLORED PRODUCTS

The present invention relates to a water-soluble azo compound or a salt thereof represented by the following formula (1): (wherein, R represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms or a sulfo group, n, m, x and y represent an integer of 1 or 2, 1 to 3, 2 to 4 and 1 to 3, respectively.) and an ink composition containing the same; the above compound or a salt thereof has a hue possessing a high vividness suitable for inkjet recording, provides various fastnesses to recorded matters, and is useful as a yellow coloring matter excellent in storage stability when prepared into an ink composition, and suitable for ink compositions, especially inks for inkjet recording.