For professionals in chemistry and related fields, a deep understanding of the properties and synthesis of key chemical intermediates is essential. Sodium 3-Sulfobenzoate (CAS 17625-03-5) is one such compound, valued for its unique structure and reactivity. This article, from the perspective of NINGBO INNO PHARMCHEM CO.,LTD., a prominent manufacturer, aims to illuminate the chemical characteristics and common synthesis routes for this important organic compound.

Chemical Structure and Nomenclature

Sodium 3-Sulfobenzoate is the sodium salt of 3-sulfobenzoic acid. Its chemical formula is C7H5NaO5S, with a molecular weight of approximately 224.17 g/mol. The structure features a benzene ring substituted with a carboxylate group (-COO-) and a sulfonate group (-SO3-) at the meta (1,3) positions. This arrangement is key to its functionality.

Common synonyms include:

• 3-Carboxybenzenesulfonic acid sodium salt
• 3-Sulfobenzoic acid monosodium salt
• 3-SSBA
• Sodium m-sulfobenzoate

The presence of both an acidic functional group (carboxylate) and a highly polar, water-soluble group (sulfonate) makes Sodium 3-Sulfobenzoate a versatile molecule in chemical reactions and formulations.

Key Chemical and Physical Properties

Manufacturers like us pay close attention to several critical properties:

• Appearance: Typically a white crystalline powder.
• Purity: Usually specified as ≥98% or ≥99% (HPLC).
• Solubility: Highly soluble in water (>500 g/L at 20°C), indicating its hydrophilic nature. It is less soluble in organic solvents.
• Melting Point: Generally reported as >300°C, indicating significant thermal stability.
• pH: A 1% aqueous solution typically has a pH between 7.0 and 9.0.
• Stability: Stable under normal storage conditions, but should be kept away from strong oxidizing agents.

These properties dictate its suitability for various applications, from acting as a reagent in synthesis to enhancing properties in functional materials.

Synthesis Pathways for Sodium 3-Sulfobenzoate

The synthesis of Sodium 3-Sulfobenzoate typically involves the sulfonation of benzoic acid or its derivatives, followed by neutralization. A common approach includes:

1. Sulfonation of Benzoic Acid: Benzoic acid is treated with a sulfonating agent, such as fuming sulfuric acid (oleum) or chlorosulfonic acid, under controlled temperature conditions. This reaction introduces the sulfonic acid group (-SO3H) onto the benzene ring. The meta position is favored under specific conditions.
2. Neutralization: The resulting 3-sulfobenzoic acid is then neutralized with a sodium-containing base, such as sodium hydroxide (NaOH) or sodium carbonate (Na2CO3), to form the sodium salt.
3. Purification: The crude Sodium 3-Sulfobenzoate is then purified through crystallization, washing, and drying processes to achieve the desired purity and physical form. Common purification methods aim to remove unreacted starting materials, by-products, and inorganic salts.

Manufacturers carefully optimize these steps to maximize yield, purity, and minimize environmental impact. Processes often focus on achieving high purity for pharmaceutical synthesis applications.

Choosing a Reliable Manufacturer

When you need to buy Sodium 3-Sulfobenzoate, selecting a manufacturer with robust R&D capabilities and strict quality control is vital. NINGBO INNO PHARMCHEM CO.,LTD. is committed to providing chemical products that meet stringent specifications, ensuring our clients receive reliable materials for their advanced chemical processes and product developments.