523-44-4 Usage
Description
ORANGE I, also known as Soluble Orange G, is a synthetic azo dye characterized by its bright orange color. It is a crystalline compound with unique solubility properties, being soluble in water to exhibit a light orange hue and slightly soluble in ethanol and acetone. ORANGE I displays distinct color changes when interacting with various chemicals, such as strong sulfuric acid, which turns it purple, and strong hydrochloric acid, which results in an orange-brown color. Its chemical structure and properties make it suitable for various applications across different industries.
Uses
Used in Textile Industry:
ORANGE I is used as a dye for wool and silk fibers due to its vibrant color and affinity for these materials. Its ability to bind with the fibers and produce a lasting color makes it a popular choice in the textile industry for creating orange-hued garments and textiles.
ORANGE I is used as a dye for [application reason] in the Textile Industry.
Used in Leather Industry:
In the leather industry, ORANGE I is utilized for dyeing leather products, providing them with an attractive orange color and enhancing their visual appeal. Its compatibility with leather materials and ability to produce a consistent color make it a preferred choice for leather dyeing processes.
ORANGE I is used as a dye for [application reason] in the Leather Industry.
Used as an Indicator:
Due to its sensitivity to pH changes and subsequent color alterations, ORANGE I is employed as an indicator in various chemical and biological assays. Its color changes in response to the presence of acids or bases, making it a useful tool for monitoring pH levels in experiments and industrial processes.
ORANGE I is used as an indicator for [application reason] in the Chemical and Biological Industries.
Preparation
4-Aminobenzenesulfonic acid diazo, and Naphthalen-1-ol?coupling.
Purification Methods
Purify the dye by dissolving it in the minimum volume of H2O, adding, with stirring, a large excess of EtOH. The salt separates as orange needles. It is collected by centrifugation or filtration, washed with absolute EtOH (3x) and Et2O (2x) in the same way and dried in a vacuum desiccator over KOH. The free acid can be recrystallised from EtOH. [Slotta & Franke Chem Ber 64 86 1931, Beilstein 16 H 275, 16 II 117, 16 IV 410.] The purity can be checked by titration with titanium chloride [Klotz J Am Chem Soc 68 2299 1946].
Check Digit Verification of cas no
The CAS Registry Mumber 523-44-4 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 5,2 and 3 respectively; the second part has 2 digits, 4 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 523-44:
(5*5)+(4*2)+(3*3)+(2*4)+(1*4)=54
54 % 10 = 4
So 523-44-4 is a valid CAS Registry Number.
InChI:InChI=1/C16H12N2O4S.Na/c19-16-10-9-15(13-3-1-2-4-14(13)16)18-17-11-5-7-12(8-6-11)23(20,21)22;/h1-10,19H,(H,20,21,22);/q;+1/p-1/b18-17+;
523-44-4Relevant articles and documents
Can be azo dyes obtained by grinding under solvent-free conditions?
Noroozi-Pesyan, Nader,Khalafy, Jabbar,Malekpoor, Zahra
experimental part, p. 1018 - 1027 (2010/09/10)
The solid-solid reactions of some electron-donors with sulfanilic acid in the presence of solid sodium nitrite afford azo dyes by self-catalyzed diazotization of sulfanilic acid (2) under solvent-free conditions with moderate yields. Also the reactions of some electron-donors with diazotization of o-nitroaniline (5), m-nitroaniline (6) and p-nitroaniline (7) in the presence of solid sodium nitrite catalyzed by p-toluenesulfonic acid (PTSA) afford azo dyes under solvent-free conditions in good yields. This new method totally avoids the use of acids, alkalies, and toxic and/or expensive solvents in diazotization and diazo coupling reactions.
