Description

o-Toluenesulfonic Acid, Phenyl Ester is a specialized organic sulfonate ester, a versatile intermediate and reagent in advanced chemical synthesis. This compound is valued for its role as a protecting group precursor and as a source of the tosylate anion in nucleophilic substitution reactions. It is primarily utilized by research institutions and manufacturers in the pharmaceutical, agrochemical, and specialty chemical sectors for developing active ingredients and fine chemicals.

Application

• Pharmaceutical Intermediate: Serves as a key building block in the synthesis of active pharmaceutical ingredients (APIs), particularly where sulfonate ester chemistry is required.
• Agrochemical Synthesis: Employed in the production of herbicides, fungicides, and other crop protection agents as a reactive intermediate.
• Polymer Chemistry: Acts as a monomer or cross-linking agent in the production of specialty polymers and resins with specific functional properties.
• Organic Synthesis Reagent: Used as a tosylating agent to introduce the tosyl (Ts) protecting group for alcohols or as a leaving group in SN2 reactions.
• Dye and Pigment Manufacturing: Functions as an intermediate in the synthesis of complex organic dyes and colorants.
• Liquid Crystal & Electronic Materials: Utilized in the synthesis of advanced materials for display technologies and electronic applications.

Basic Information

Product Name	o-Toluenesulfonic Acid, Phenyl Ester
CAS No.	91903-33-2
Molecular Formula	C13H12O3S
Molecular Weight	248.30 g/mol
Synonyms	Phenyl o-Toluenesulfonate; Phenyl 2-Methylbenzenesulfonate; 2-Methylbenzenesulfonic Acid Phenyl Ester; o-Tolyl Phenyl Sulfonate; Phenyl Tosylate (o-isomer); Benzenesulfonic Acid, 2-Methyl-, Phenyl Ester; Phenyl 2-Toluenesulfonate
EINECS	Contact for details

Quality Control

Our o-Toluenesulfonic Acid, Phenyl Ester is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including chromatographic purity assays and identity confirmation, to ensure it meets precise customer specifications and industry standards. Certificates of Analysis (COA) detailing all quality parameters are provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong bases, oxidizing agents, and sources of ignition. Due to its nature as a strong acid/organic solvent derivative, handle with appropriate personal protective equipment.

Specification

Item	Specification
Appearance	White to off-white crystalline powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	Contact for details
Loss on Drying	≤ 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.