Description

4-Chloro-5-Methoxypyridazin-3(2H)-One is a versatile heterocyclic building block and key synthetic intermediate of significant importance in advanced organic synthesis. Its unique pyridazinone scaffold, functionalized with chloro and methoxy groups, makes it a critical precursor for the development of novel active pharmaceutical ingredients (APIs) and agrochemicals. This compound is primarily sought by research institutions and industrial manufacturers in the pharmaceutical, agrochemical, and specialty chemical sectors for constructing complex molecular architectures.

Application

• Pharmaceutical Intermediate: Serves as a core scaffold for the synthesis of novel drug candidates, particularly in therapeutic areas requiring heterocyclic motifs.
• Agrochemical Synthesis: Used as a key building block in the research and development of new herbicides, fungicides, and insecticides.
• Chemical Research & Development: A valuable reagent for medicinal chemistry and process chemistry for exploring structure-activity relationships (SAR).
• Specialty Chemical Production: Employed in the manufacture of dyes, pigments, and other performance chemicals where the pyridazinone structure imparts specific properties.
• Academic Research: Utilized in university and institutional labs for synthetic methodology development and the creation of novel chemical libraries.

Basic Information

Product Name	4-Chloro-5-Methoxypyridazin-3(2H)-One
CAS No.	63910-43-0
Molecular Formula	C5H5ClN2O2
Molecular Weight	160.56 g/mol
Synonyms	4-Chloro-5-methoxy-2,3-dihydropyridazin-3-one; 4-Chloro-5-methoxy-3(2H)-pyridazinone; 5-Methoxy-4-chloropyridazin-3(2H)-one; 3(2H)-Pyridazinone, 4-chloro-5-methoxy-; 4-Chloro-5-methoxypyridazin-3-ol; 4-Chloro-5-methoxy-1,2-dihydropyridazin-3-one
EINECS	Contact for details

Quality Control

Our 4-Chloro-5-Methoxypyridazin-3(2H)-One is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing, including HPLC, NMR, and IR spectroscopy, to ensure identity, purity, and consistency. Certificates of Analysis (COA) documenting all critical parameters 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, and well-ventilated area at room temperature (15-25°C). Keep away from incompatible materials such as strong bases and strong oxidizing agents.

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.