Description

4-Isoxazolecarbonyl Chloride, 5-Ethyl- (9Ci) is a versatile and highly reactive organic intermediate, specifically an acid chloride derivative of an isoxazole heterocycle. Its core value lies in its ability to efficiently introduce the 5-ethylisoxazole-4-carbonyl moiety into target molecules, enabling the synthesis of complex compounds with potential biological activity. This compound is primarily needed by research chemists and process development scientists in the pharmaceutical and agrochemical industries for the development of new active ingredients and fine chemicals.

Application

• Pharmaceutical Intermediate: Key building block for the synthesis of novel drug candidates, particularly in medicinal chemistry programs targeting heterocyclic scaffolds.
• Agrochemical Synthesis: Used in the research and development of new herbicides, fungicides, and insecticides that incorporate the isoxazole ring system.
• Chemical Research & Development: Serves as a critical reagent in academic and industrial R&D for exploring new chemical reactions and creating specialized libraries of compounds.
• Peptide Mimetics & Bio-conjugation: The reactive carbonyl chloride group facilitates coupling reactions for creating peptide analogs or attaching functional groups to biomolecules.
• Material Science Precursor: Potential use in the synthesis of specialized polymers or ligands with unique electronic or binding properties.

Basic Information

Product Name	4-Isoxazolecarbonyl Chloride, 5-Ethyl- (9Ci)
CAS No.	99803-82-4
Molecular Formula	C6H6ClNO2
Molecular Weight	159.57 g/mol
Synonyms	5-Ethylisoxazole-4-carbonyl chloride; 5-Ethyl-4-isoxazolecarbonyl chloride; 4-Carbonyl chloride-5-ethylisoxazole; 5-Ethyl-1,2-oxazole-4-carbonyl chloride
EINECS	Contact for details

Quality Control

Our 4-Isoxazolecarbonyl Chloride, 5-Ethyl- (9Ci) is produced under strict quality management protocols. Each batch undergoes rigorous analytical testing to ensure high purity and consistency. Certificates of Analysis (COA) detailing purity, identity, and impurity profiles are provided and available upon request to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated place at a controlled room temperature (typically 15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed under an inert atmosphere (e.g., nitrogen or argon) after opening to prevent decomposition. Keep away from strong acids and incompatible materials.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid or solid
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 95%
Water Content (KF)	≤ 0.5%

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