Description

Ethyl Methanethiosulfonate is a versatile organosulfur compound with the CAS number 2043-76-7, widely recognized for its role as a key reagent in chemical synthesis. This compound is particularly valued for its ability to introduce thiol-protecting groups or serve as an alkylating agent in complex organic transformations. It is an essential building block for researchers and manufacturers in the pharmaceutical, agrochemical, and material science industries who require precise and reliable sulfur chemistry.

Application

• Pharmaceutical Intermediate: Key reagent in the synthesis of active pharmaceutical ingredients (APIs), particularly those containing sulfur-based functional groups.
• Bioconjugation Chemistry: Used for the selective modification of cysteine residues in peptides and proteins for drug development and biochemical research.
• Agrochemical Synthesis: Serves as a precursor in the manufacture of certain herbicides, fungicides, and plant growth regulators.
• Polymer & Material Science: Employed in the surface functionalization of materials and as a monomer or cross-linking agent in specialty polymer production.
• Chemical Research: A fundamental tool in organic synthesis laboratories for constructing sulfur-containing heterocycles and complex molecules.
• Flavor & Fragrance Industry: Potential use as an intermediate in the synthesis of specific sulfur-containing aroma compounds.

Basic Information

Product Name	Ethyl Methanethiosulfonate
CAS No.	2043-76-7
Molecular Formula	C3H8O2S2
Molecular Weight	140.22 g/mol
Synonyms	Ethyl Methanesulfonothioate; Ethyl Methanethiosulfonate; Methanethiosulfonic Acid Ethyl Ester; Ethyl Methanesulfonothiolate; EMS; Ethyl Methanethiosulphonate; S-Ethyl Methanethiosulfonate; Ethyl Methanesulfonothioic Acid Ester
EINECS	218-048-9

Quality Control

Our Ethyl Methanethiosulfonate is produced under strict quality management protocols. Each batch undergoes comprehensive analytical testing, including chromatography (GC/HPLC) and spectroscopic methods, to ensure high purity and consistency. A detailed Certificate of Analysis (COA) is provided with every shipment, confirming compliance with agreed specifications. We adhere to cGMP principles where applicable to support our customers in regulated industries.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at room temperature (15-25°C). Due to its highly volatile nature, ensure containers are kept tightly sealed when not in use to prevent evaporation and potential concentration changes. Keep away from heat, sparks, and open flame.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 98.0%
Purity (HPLC)	≥ 97.0%
Water Content (KF)	≤ 0.5%
Residue on Ignition	≤ 0.1%

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