6361-37-1

Basic information

• Product Name: 1-naphthol-4,7-disulfonic acid
• Synonyms: 1-naphthol-4,7-disulfonic acid
• CAS NO: 6361-37-1
• Molecular Formula: C₁₀H₈O₇S₂
• Molecular Weight: 304.29632
• Mol File: 6361-37-1.mol
• Article Data: 1

Chemical Properties

• Appearance: /
• CAS DataBase Reference: 1-naphthol-4,7-disulfonic acid(CAS DataBase Reference)
• NIST Chemistry Reference: 1-naphthol-4,7-disulfonic acid(6361-37-1)
• EPA Substance Registry System: 1-naphthol-4,7-disulfonic acid(6361-37-1)

Safety Data

• Hazardous Substances Data: 6361-37-1(Hazardous Substances Data)

Usage

Description

1-naphthol-4,7-disulfonic acid is a compound that consists of naphthol and sulfonic acid groups, known for its ability to change color in response to changes in acidity.

Uses

Used in Dye Synthesis:
1-naphthol-4,7-disulfonic acid is used as a precursor in the production of azo dyes for its solubility in water and its role in dyeing processes.
Used in Textile Industry:
1-naphthol-4,7-disulfonic acid is used as a dye ingredient for coloring textiles, due to the azo dyes' variety of colors and their application in this industry.
Used in Plastics Industry:
1-naphthol-4,7-disulfonic acid is used as a coloring agent in the plastics industry, where azo dyes provide a range of color options for plastic products.
Used in Printing Industry:
1-naphthol-4,7-disulfonic acid is used as a component in ink formulations for the printing industry, taking advantage of the colorfast properties of azo dyes.
Used as a pH Indicator:
1-naphthol-4,7-disulfonic acid is used as a pH indicator due to its color-changing properties in response to acidity levels.
Used in Chemical Research and Analysis:
1-naphthol-4,7-disulfonic acid is used as a reagent or standard for calibration in chemical research and analysis, benefiting from its solubility and color-changing characteristics.

Upstream product

• 134-32-7 1-amino-naphthalene 
• 84-86-6 4-amino-1-naphthalenesufonic acid 
• 85-75-6 4-aminonaphthalene-1,6-disulfonic acid 
• 7732-18-5 water 
• 7647-01-0 hydrogenchloride 
• 66550-45-6 1-hydroxy-4,7-disulfo-[2]naphthoic acid 
• 90-15-3 α-naphthol 
• 65312-90-5 4-chloro-naphthalene-1,6-disulfonic acid 
• 3159-41-9 bisnaphthyl carbonate 

Downstream Products

• 20191-62-2 8-hydroxy-naphthalene-2-sulfonic acid 
• 687623-27-4 3-amino-4-hydroxy-naphthalene-1,6-disulfonic acid 

Relevant articles and documents

Sulfonation of 1- and 2-naphthol and their methanesulfonate esters with sulfur trioxide. The influence of initial sulfation on the sulfo-product composition

The sulfonation of 1- and 2-naphthol with sulfur trioxide in C(2)H3NO2 has been studied by using 1H NMR. 1-Naphthol (1) yields, upon reaction with 1.0 mol-equiv of SO3, a mixture of 2- and 4-sulfonic acids (2- and 4-S); upon increasing the reaction temperature, the relative amount of 2-S increases.Upon reaction with 4.0 mol-equiv of SO3, the initially observed products are the hydrogen sulfate 1-O,2,4-S3 and some corresponding sulfonic anhydrides.After prolonged reaction times, some 1-O-4,7-S3 is formed. 2-Naphthol (3), upon reaction with 1.0 mol-equiv of SO3, yields a 85:15 mixture of 1-S and 8-S, whereas upon reaction with 2.0 mol-equiv of SO3, a 8:14:78 mixture of 5-S, 6-S and 8-S are formed.Sulfonation of 3, either by (i) reaction with 1.2 and, subsequently, an additional 2.0 mol-equiv of SO3, or (ii) by direct addition of 4.0 mol-equiv of SO3, yields a mixture of the carbyl sulfates 5-5-S and 5-6-S and the hydrogen sulfate 3-O,6,8-S3, the relative yield depending on the method used.The results are discussed in terms of initial formation of the corresponding naphthyl hydrogen sulfates and on the basis of a comparison with the reactions of 1- and 2-naphthyl methanesulfonates, the chosen model compounds for the hydrogen sulfates, with SO3.