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4-Aminobenzenesulfonic acid (CAS 121-57-3) is a foundational building block in the API intermediates market, serving as a critical precursor for the synthesis of sulfonamide antibiotics and various high-performance azo dyes. As a premier bulk chemical supplier, we note that CDMOs are increasingly demanding high purity fine chemicals (Pharma/API purity 99% | General Industry purity 98%) to ensure precise diazotization and coupling reactions while minimizing nitro-aromatic impurities. 4-Anilinesulfonic acid (CAS 121-57-3) has experienced a significant shift in global sourcing strategies, with manufacturers prioritizing custom synthesis services that offer robust analytical validation and compliance with evolving REACH and environmental standards. This transition reflects a broader industry movement toward securing reliable, high-performance chemical precursors that optimize yields in large-scale commercial manufacturing and withstand rigorous quality audits. p-Aminophenylsulfonic acid (CAS 121-57-3) remains the preferred choice for advanced process development in both the textile and pharmaceutical sectors, where maintaining consistent crystalline morphology is essential for downstream stability and reactivity. To address these sophisticated technical requirements, suppliers are adopting optimized sulfonation protocols to deliver consistent batches (Pharma/API purity 99% | General Industry purity 98%), aligning with global sustainability initiatives and the necessity for high-purity building blocks that guarantee final product integrity. We are an established global intermediates supplier with >= 99% purity, ensuring minimal carry-over of impurities in the final API, and a broad range of various pharmaceutical intermediates for API manufacturers and finished formulators, providing comprehensive analytical (HPLC/NMR/MS) and supporting Sulfanilic acid COA/TDS/SDS region-specific regulatory support. reliable lead times, worldwide supply chain capabilities
4-Aminobenzenesulfonic acid (CAS 121-57-3) is a foundational building block in the API intermediates market, serving as a critical precursor for the synthesis of sulfonamide antibiotics and various high-performance azo dyes. As a premier bulk chemical supplier, we note that CDMOs are increasingly demanding high purity fine chemicals (Pharma/API purity 99% | General Industry purity 98%) to ensure precise diazotization and coupling reactions while minimizing nitro-aromatic impurities. 4-Anilinesulfonic acid (CAS 121-57-3) has experienced a significant shift in global sourcing strategies, with manufacturers prioritizing custom synthesis services that offer robust analytical validation and compl...
Chemical Properties & Specifications
P261, P272, P280, P302+P352, P333+P313, P321, P363, and P501
Skin Sens. 1 (100%)
Eye Irrit. 2 (89.5%)
A primary chemical building block utilized in the synthesis of diverse azo dyes, including methyl orange and Orange II, for applications in the textile, leather, and food industries
A critical precursor in the organic synthesis of sulfonamides and other antimicrobial agents used in medicinal chemistry
A specialized reagent employed in the quantitative colorimetric analysis of nitrate and nitrite ions via diazonium coupling reactions
A versatile intermediate used for the functionalization of single-walled carbon nanotubes and as a dopant in the chemical synthesis of polyaniline
An organic compound used in the manufacture of pesticides and agents for the prevention and control of wheat rust.
Sulfanilic acid, also known as 4-aminobenzenesulfonic acid, is a synthetic organic compound primarily used as a raw material and intermediate in the production of azo dyes, optical brighteners, and sulfonamide pharmaceuticals
This compound is widely utilized in the textile, pharmaceutical, food, paper, and construction industries for the manufacturing of colorants, antibiotics, and concrete additives
It is soluble in water (approximately 10 g/L at 20 °C) and sodium carbonate solutions, and it is frequently used in aqueous-based synthesis and diazotization reactions
Standard specifications include CAS number 121-57-3, high purity (typically ≥99%), and documentation such as COA, TDS, impurity reports, and regulatory compliance documents
Scimplify has capabilities for global distribution and custom synthesis through an integrated network of manufacturers and logistics partners with reliable lead time
The product is export ready with a standard MOQ starting from 100 kgs, with lead times for international customers depending on the shipping destination and specific grade.
