Description

Mercaptosuccinic Acid CAS NO 70-49-5 is a versatile organosulfur compound featuring both a thiol (-SH) and two carboxylic acid (-COOH) functional groups. This unique bifunctional structure makes it a valuable intermediate and reagent in chemical synthesis and industrial processes. It is primarily utilized in the pharmaceutical, agrochemical, and polymer industries for applications ranging from chiral synthesis to metal chelation and polymer modification.

Application

• Pharmaceutical Intermediate: Key building block for synthesizing active pharmaceutical ingredients (APIs), particularly in the development of drugs targeting cardiovascular and metabolic diseases.
• Chiral Synthesis & Resolution: Used as a chiral auxiliary or resolving agent for the production of enantiomerically pure compounds due to its asymmetric carbon center.
• Polymer Modification & Cross-linking Agent: Imparts thiol functionality to polymers for cross-linking, improving thermal stability and mechanical properties in specialty resins and coatings.
• Metal Chelation & Surface Treatment: Acts as a chelating agent for heavy metals in wastewater treatment and as a component in surface finishing baths for metals.
• Agrochemical Synthesis: Intermediate in the production of certain herbicides, fungicides, and plant growth regulators.
• Biochemical Research: Used in proteomics and biochemistry as a reducing agent and for modifying protein thiol groups.

Basic Information

Product Name	Mercaptosuccinic Acid
CAS No.	70-49-5
Molecular Formula	C4H6O4S
Molecular Weight	150.15 g/mol
Synonyms	Thiomalic Acid; 2-Mercaptosuccinic Acid; 2-Sulfanylbutanedioic Acid; USAF EK-4960; NSC 9231; DL-Mercaptosuccinic Acid; (±)-Mercaptosuccinic Acid
EINECS	200-739-6

Quality Control

Our Mercaptosuccinic Acid is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets high-purity standards suitable for pharmaceutical and fine chemical applications. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to guarantee traceability and batch-to-batch consistency.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at a controlled room temperature (15-25°C). Due to its hygroscopic and easily oxidized nature, it is recommended to store the material under an inert atmosphere (e.g., nitrogen) for long-term preservation and to minimize moisture uptake and oxidation.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Melting Point	149 - 153 °C
Loss on Drying	≤ 1.0 %
Heavy Metals (as Pb)	≤ 20 ppm
Residue on Ignition	≤ 0.1 %

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.