Description

o-Toluenesulfonic Acid, Methyl Ester is a versatile organic sulfonate ester, a key intermediate in fine chemical synthesis. Its primary value lies in its role as an effective alkylating agent and protecting group reagent, facilitating the synthesis of complex molecules. This compound is essential for research and production in the pharmaceutical, agrochemical, and specialty chemical industries, where precise chemical transformations are required.

Application

• Pharmaceutical Intermediate: Used in the synthesis of active pharmaceutical ingredients (APIs), particularly as a sulfonating or alkylating agent in multi-step organic reactions.
• Agrochemical Synthesis: Serves as a building block for manufacturing herbicides, fungicides, and other crop protection agents.
• Dye and Pigment Production: Acts as an intermediate in the creation of sulfonated dyes and organic pigments.
• Polymer Chemistry: Employed as a monomer or modifying agent in the production of specialty polymers and resins.
• Chemical Research: A valuable reagent in academic and industrial R&D labs for method development and novel compound synthesis.
• Flavor and Fragrance Industry: Used in the synthesis of certain aromatic compounds.

Basic Information

Product Name	o-Toluenesulfonic Acid, Methyl Ester
CAS No.	23373-38-8
Molecular Formula	C8H10O3S
Molecular Weight	186.23 g/mol
Synonyms	Methyl o-Toluenesulfonate; 2-Methylbenzenesulfonic Acid Methyl Ester; Methyl 2-Methylbenzenesulfonate; Methyl Tosylate (o-isomer); o-Tolyl Methyl Sulfonate; 2-Toluenesulfonic Acid Methyl Ester; Methyl 2-Toluenesulfonate; o-Methyl Tosylate
EINECS	245-609-1

Quality Control

Our o-Toluenesulfonic Acid, Methyl Ester is manufactured under strict quality control protocols to ensure batch-to-batch consistency and high purity. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing key parameters such as assay, identity, and impurity profiles. Our quality management system is designed to meet the rigorous standards required by our global B2B clients in regulated industries.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area away from incompatible materials such as strong bases and oxidizing agents. Recommended storage temperature is between 15°C and 25°C. Keep container tightly sealed when not in use to prevent moisture absorption and degradation.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 0.5%
Related Substances (HPLC)	Total impurities ≤ 2.0%
Density (at 20°C)	~1.25 g/cm³

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