Description

5-Isoxazolecarboxylic Acid, 3-Acetyl-, Methyl Ester (9Ci) is a high-purity heterocyclic building block with significant synthetic utility. This compound serves as a versatile intermediate in the development of novel active pharmaceutical ingredients (APIs) and agrochemicals. It is primarily sought after by research and development teams in the pharmaceutical, agrochemical, and fine chemical industries for constructing complex molecular architectures.

Application

• Pharmaceutical Intermediate: A key synthon for the synthesis of novel drug candidates, particularly those targeting central nervous system (CNS) disorders and anti-inflammatory applications.
• Agrochemical Research: Used in the development of new herbicides, fungicides, and insecticides, leveraging the isoxazole ring's bioactivity.
• Fine Chemical Synthesis: Serves as a versatile building block for creating complex heterocyclic compounds in custom synthesis and process development.
• Material Science Research: Potential precursor for the development of specialty polymers, ligands, and functional materials with specific electronic properties.
• Academic & Contract Research: Essential for medicinal chemistry programs and methodological studies in universities and contract research organizations (CROs).

Basic Information

Product Name	5-Isoxazolecarboxylic Acid, 3-Acetyl-, Methyl Ester (9Ci)
CAS No.	359689-20-6
Molecular Formula	C7H7NO4
Molecular Weight	169.14 g/mol
Synonyms	Methyl 3-Acetyl-5-isoxazolecarboxylate; 3-Acetyl-5-isoxazolecarboxylic Acid Methyl Ester; Methyl 3-acetyl-1,2-oxazole-5-carboxylate; 1,2-Oxazole-5-carboxylic acid, 3-acetyl-, methyl ester; 3-Acetyl-5-methoxycarbonylisoxazole; 5-Carbomethoxy-3-acetylisoxazole
EINECS	Contact for details

Quality Control

Our 5-Isoxazolecarboxylic Acid, 3-Acetyl-, Methyl Ester (9Ci) is manufactured under strict quality control protocols to ensure batch-to-batch consistency and high purity suitable for research and development applications. We provide comprehensive Certificates of Analysis (COA) with each batch, detailing purity, identity, and impurity profiles. Our quality management system supports compliance with cGMP and ISO standards for reliable sourcing.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at controlled room temperature (15-25°C). Keep away from heat, sparks, and open flame. The product is light-sensitive and should be stored away from light.

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	≤ 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.