Aniline-2-sulfonic acid
Aniline-2-sulfonic acid (CAS: 88-21-1), with the molecular formula H2NC6H4SO3H and a molecular weight of 173.19 g/mol, is an organic compound featuring both an amino group and a sulfonic acid group attached to a benzene ring. It serves as a valuable building block in chemical synthesis, particularly in the production of dyes and pharmaceutical intermediates. This compound is supplied by Tech Serve Solutions with an assay of 95%.
- IUPAC
- 2-Aminobenzenesulfonic acid,o-Sulfanilic acid,Orthanilic acid
- Synonyms
- 2-Aminobenzenesulfonic acido-Sulfanilic acidOrthanilic acid

Dye Synthesis
Aniline-2-sulfonic acid is utilised as an intermediate in the synthesis of various azo dyes. The presence of both amine and sulfonic acid functionalities allows for diverse coupling reactions and solubility modifications in the resulting dye molecules.
Pharmaceutical Intermediates
This compound acts as a crucial building block in the preparation of certain pharmaceutical compounds. Its structure can be incorporated into more complex molecules, contributing to the development of active pharmaceutical ingredients (APIs).
Organic Synthesis Reagent
As a versatile organic building block, Aniline-2-sulfonic acid is employed in a range of chemical transformations. It facilitates the introduction of sulfonate and amino functionalities into organic structures for research and development purposes.
| Molecular weight | 173.19 |
|---|---|
| Linear formula | H2NC6H4SO3H |
| Assay | 95% |

Hazard statements
- H314Causes severe skin burns and eye damage
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
- P310Immediately call a POISON CENTER or doctor
| Protective equipment | Eyeshields, Faceshields, full-face particle respirator type N100 (US), Gloves, respirator cartridge type N100 (US), type P1 (EN143) respirator filter, type P3 (EN 143) respirator cartridges |
|---|---|
| Transport (UN / ADR) | UN 2585 8/PG 3 |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | C |
| Risk statements (R) | 34 |
| Safety statements (S) | 26-36/37/39-45 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Aniline-2-sulfonic acid used for?
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Aniline-2-sulfonic acid is primarily used as a building block in organic synthesis, particularly for the creation of dyes and pharmaceutical intermediates.
What are the CAS number and formula for Aniline-2-sulfonic acid?
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The CAS number for Aniline-2-sulfonic acid is 88-21-1, and its molecular formula is H2NC6H4SO3H.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Aniline-2-sulfonic acid with an assay of 95%. This product is not represented as USP, BP, EP, or any other pharmacopoeia grade.
How should Aniline-2-sulfonic acid be handled safely?
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Aniline-2-sulfonic acid is classified as a Danger hazard, causing severe skin burns and eye damage (H314). Appropriate personal protective equipment, including eyeshields, faceshields, gloves, and suitable respiratory protection, is essential. Handle in a well-ventilated area and follow all safety data sheet instructions.
Is Aniline-2-sulfonic acid packed and shipped globally by TSS?
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Yes, Tech Serve Solutions is a global supplier and exporter of fine chemicals, including Aniline-2-sulfonic acid, adhering to international shipping regulations (e.g., UN 2585, Class 8, Packing Group III).
How can I request a quote or sample?
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To request a quote or sample of Aniline-2-sulfonic acid, please contact our sales team through the website or by phone, providing your specific requirements and shipping details.
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