Description

1H-Pyrazole-4-Carbonyl Chloride, 5-Chloro-3-Ethyl-1-Methyl- (9Ci) is a high-purity, functionalized pyrazole derivative serving as a critical building block in advanced organic synthesis. Its value lies in the reactive acid chloride group, which enables efficient coupling reactions to construct complex molecular architectures. This intermediate is essential for researchers and manufacturers in the pharmaceutical and agrochemical industries developing novel active ingredients.

Application

• Pharmaceutical Intermediate: Key precursor in the synthesis of novel drug candidates, particularly those targeting central nervous system (CNS) disorders and metabolic diseases.
• Agrochemical Synthesis: Building block for developing next-generation herbicides, fungicides, and insecticides with improved efficacy and selectivity.
• Material Science Research: Used in the creation of specialized polymers and organic electronic materials requiring precise heterocyclic structures.
• Chemical Biology Probes: Facilitates the labeling and modification of biomolecules for diagnostic and research applications.
• Custom Synthesis & Contract Manufacturing: Supplied to CDMOs for the production of bespoke compounds and scaled-up processes.

Basic Information

Product Name	1H-Pyrazole-4-Carbonyl Chloride, 5-Chloro-3-Ethyl-1-Methyl- (9Ci)
CAS No.	128564-58-9
Molecular Formula	C7H8Cl2N2O
Molecular Weight	207.06 g/mol
Synonyms	5-Chloro-3-ethyl-1-methyl-1H-pyrazole-4-carbonyl chloride; 5-Chloro-3-ethyl-1-methylpyrazole-4-carbonyl chloride; 1-Methyl-5-chloro-3-ethylpyrazole-4-carbonyl chloride; 1H-Pyrazole-4-carbonyl chloride, 5-chloro-3-ethyl-1-methyl-; 128564-58-9; 5-Chloro-3-ethyl-1-methyl-1H-pyrazole-4-carboxylic acid chloride
EINECS	Contact for details

Quality Control

Every batch of 1H-Pyrazole-4-Carbonyl Chloride, 5-Chloro-3-Ethyl-1-Methyl- (9Ci) is produced and tested under a strict quality management system. We ensure compliance with relevant industry standards for fine chemical intermediates. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with each shipment to guarantee traceability and batch-to-batch consistency for your critical R&D and production needs.

Storage

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

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Related Substances (HPLC)	Total impurities ≤ 2.0%
Water Content (KF)	≤ 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.