Description

1H-Pyrazole-1-Carbonyl Chloride, 5-Ethyl-4,5-Dihydro-4-Methyl- (9Ci) is a specialized heterocyclic acid chloride derivative, serving as a critical building block in advanced organic synthesis. Its reactive carbonyl chloride group makes it an essential reagent for introducing the pyrazole moiety into target molecules, enabling the creation of complex chemical architectures. This high-purity intermediate is primarily sought by research and development laboratories and production facilities in the pharmaceutical and agrochemical sectors for the synthesis of novel active ingredients.

Application

• Pharmaceutical Intermediate: Key precursor in the synthesis of novel drug candidates, particularly those targeting central nervous system (CNS) disorders, inflammation, and metabolic diseases.
• Agrochemical Synthesis: Used in the research and development of next-generation herbicides, fungicides, and insecticides, leveraging the pyrazole scaffold's bioactivity.
• Material Science Research: Acts as a monomer or cross-linking agent in the development of specialty polymers and functional materials with tailored properties.
• Chemical Biology & Proteomics: Employed as a reactive handle for bioconjugation, labeling biomolecules, or creating activity-based probes for enzyme studies.
• Custom Synthesis & Contract Manufacturing: Supplied to CDMOs (Contract Development and Manufacturing Organizations) for the production of bespoke compounds for client projects.

Basic Information

Product Name	1H-Pyrazole-1-Carbonyl Chloride, 5-Ethyl-4,5-Dihydro-4-Methyl- (9Ci)
CAS No.	89662-72-6
Molecular Formula	C7H9ClN2O
Molecular Weight	172.61 g/mol
Synonyms	5-Ethyl-4,5-dihydro-4-methyl-1H-pyrazole-1-carbonyl chloride; 4-Methyl-5-ethyl-4,5-dihydro-1H-pyrazole-1-carbonyl chloride; 1-Pyrazolecarbonyl chloride, 4,5-dihydro-5-ethyl-4-methyl-; 5-Ethyl-4-methyl-4,5-dihydro-1H-pyrazole-1-carbonyl chloride
EINECS	Contact for details

Quality Control

Every batch of 1H-Pyrazole-1-Carbonyl Chloride, 5-Ethyl-4,5-Dihydro-4-Methyl- (9Ci) is manufactured and tested under strict quality management systems. 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 consistent quality and traceability for your critical synthesis workflows.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place. Due to its hygroscopic (moisture-sensitive) nature and reactivity as a strong acid/organic solvent derivative, the container must be kept tightly sealed under an inert atmosphere (e.g., nitrogen or argon) after opening to prevent decomposition. Recommended long-term storage temperature is 2-8°C.

Specification

Item	Specification
Appearance	White to off-white crystalline powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 97.0%
Water Content (KF)	≤ 0.5%
Related Substances (HPLC)	Total impurities ≤ 2.0% Any single impurity ≤ 1.0%

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