Description

p-Toluenesulfonic Acid n-Butyl Ester is an organic chemical ester derived from p-toluenesulfonic acid, serving as a versatile intermediate and reagent in specialized synthesis. This compound is valued for its role as an alkylating agent and a protected form of the sulfonic acid group, offering controlled reactivity in demanding chemical processes. It is primarily utilized by research institutions and industrial manufacturers in the pharmaceutical, agrochemical, and advanced material sectors for the development of active ingredients and functional polymers.

Application

• Pharmaceutical Intermediate: Used in the synthesis of active pharmaceutical ingredients (APIs) where the butyl ester group acts as a protecting group or a precursor for further functionalization.
• Agrochemical Synthesis: Serves as a key building block in the production of herbicides, fungicides, and other crop protection agents.
• Polymer Chemistry: Employed as a monomer or cross-linking agent in the production of specialty polymers, including ion-exchange resins and high-performance materials.
• Organic Synthesis Reagent: Functions as an alkylating agent or a source of the p-toluenesulfonyl (tosyl) group in various nucleophilic substitution and esterification reactions.
• Dye and Pigment Manufacturing: Acts as an intermediate in the synthesis of sulfonated dyes and organic pigments.
• Chemical Research: Utilized in laboratory-scale research for method development and the synthesis of novel organic compounds.

Basic Information

Product Name	p-Toluenesulfonic Acid n-Butyl Ester
CAS No.	778-28-9
Molecular Formula	C11H16O3S
Molecular Weight	228.31 g/mol
Synonyms	Butyl p-toluenesulfonate; n-Butyl tosylate; 4-Methylbenzenesulfonic acid butyl ester; Tosic acid butyl ester; p-Toluenesulfonic acid butyl ester; Butyl 4-methylbenzenesulfonate; n-Butyl p-toluenesulfonate; Butyltosylate
EINECS	212-307-6

Quality Control

Our p-Toluenesulfonic Acid n-Butyl Ester is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including identity confirmation by IR spectroscopy and purity determination by chromatographic methods (HPLC/GC), to ensure it meets precise specifications. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee traceability and batch-to-batch consistency for your critical applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at ambient temperature (15-25°C). Keep away from heat, sparks, and open flame. Due to its light-sensitive nature, containers should be kept in the original packaging or opaque containers until use.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 0.5%
Refractive Index (n20D)	1.500 - 1.510
Density (20°C)	1.15 - 1.20 g/mL

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