Description

4-Isoxazolecarboxylicacid,5-tert-Butyl-3-Phenyl-,Etester(4Ci) is a specialized heterocyclic building block of significant interest in advanced organic synthesis. This compound matters for its role as a key intermediate in the development of novel active pharmaceutical ingredients (APIs) and agrochemicals, where its unique isoxazole core provides valuable chemical functionality. It is primarily needed by R&D chemists and process development scientists in the pharmaceutical, agrochemical, and fine chemical industries for constructing complex molecular architectures.

Application

• As a key synthetic intermediate in pharmaceutical research for novel drug candidates.
• Building block for agrochemical active ingredients, including herbicides and fungicides.
• Precursor in the synthesis of specialty fine chemicals and functional materials.
• Used in academic and industrial R&D for method development and library synthesis.
• Intermediate for ligand and catalyst development in organometallic chemistry.
• Starting material for the preparation of biologically active isoxazole derivatives.

Basic Information

Product Name	4-Isoxazolecarboxylicacid,5-tert-Butyl-3-Phenyl-,Etester(4Ci)
CAS No.	858490-10-5
Molecular Formula	C16H19NO3
Molecular Weight	273.33 g/mol
Synonyms	5-tert-Butyl-3-phenylisoxazole-4-carboxylic acid ethyl ester; Ethyl 5-tert-butyl-3-phenyl-1,2-oxazole-4-carboxylate; 5-(tert-Butyl)-3-phenylisoxazole-4-carboxylic acid ethyl ester; 4-Carbethoxy-5-tert-butyl-3-phenylisoxazole; 858490-10-5; 5-tert-Butyl-3-phenyl-4-isoxazolecarboxylic acid ethyl ester; Ethyl 5-(tert-butyl)-3-phenylisoxazole-4-carboxylate
EINECS	Contact for details

Quality Control

Our 4-Isoxazolecarboxylicacid,5-tert-Butyl-3-Phenyl-,Etester(4Ci) is produced under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure identity, purity, and consistency, meeting the high standards required for research and process chemistry. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with every shipment and is available upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (typically 15-25°C). Keep away from incompatible materials. For long-term storage, consider an inert atmosphere to maintain optimal stability.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 97.0%
Purity (HPLC, Area %)	≥ 98.0%
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.