Description

Methanesulfonic Acid 4-Aminophenyl Ester is a specialized organic chemical building block characterized by its reactive methanesulfonate (mesylate) ester and aniline functional groups. This compound matters for its role as a versatile intermediate in the synthesis of more complex molecules, particularly in pharmaceutical and agrochemical research. It is primarily needed by R&D chemists and process development scientists in the fine chemical, pharmaceutical, and life science industries for constructing active pharmaceutical ingredients (APIs) and advanced materials.

Application

• Pharmaceutical Intermediate: Key building block in the synthesis of active pharmaceutical ingredients (APIs), particularly for compounds requiring an aniline or protected amine linkage.
• Agrochemical Synthesis: Used in research and development for creating novel herbicides, fungicides, and plant growth regulators.
• Polymer Chemistry: Serves as a monomer or functionalization agent in the production of specialty polymers and advanced materials.
• Dye and Pigment Manufacturing: Intermediate in the synthesis of azo dyes and other complex colorants.
• Cross-coupling Reactions: Utilized in palladium-catalyzed reactions, such as Buchwald-Hartwig amination, as an electrophilic coupling partner.
• Bioconjugation and Proteomics: Potential use in modifying proteins or peptides due to the reactivity of the mesylate group.

Basic Information

Product Name	Methanesulfonic Acid 4-Aminophenyl Ester
CAS No.	24690-19-5
Molecular Formula	C7H9NO3S
Molecular Weight	187.22 g/mol
Synonyms	4-Aminophenyl methanesulfonate; p-Aminophenyl methanesulfonate; 4-Methanesulfonyloxyaniline; Mesylic acid 4-aminophenyl ester; Aniline, 4-(methylsulfonyloxy)-; 4-(Methylsulfonyloxy)aniline; p-(Methylsulfonyloxy)aniline; CAS 24690-19-5
EINECS	Contact for details

Quality Control

Our Methanesulfonic Acid 4-Aminophenyl Ester is produced under strict quality management protocols. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation by IR and NMR spectroscopy, to ensure it meets the high standards required for research and industrial synthesis. Certificates of Analysis (COA) with batch-specific data are available upon request to support your quality assurance and regulatory documentation needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated place at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); ensure the container is sealed after each use to prevent degradation from atmospheric moisture.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 98.0%
Melting Point	Contact for details
Loss on Drying	≤ 1.0%
Heavy Metals	≤ 20 ppm

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