Description

1-Ethyl-3-Methyl-1H-Pyrazole-5-Sulfonyl Chloride is a high-purity, reactive sulfonyl chloride derivative essential for advanced chemical synthesis. This compound serves as a critical building block for introducing the sulfonyl functional group, enabling the creation of complex molecules with tailored properties. It is primarily sought by research chemists and process development scientists in the pharmaceutical and agrochemical industries for the synthesis of novel active ingredients and fine chemicals.

Application

• Pharmaceutical Intermediate: A key precursor in the synthesis of active pharmaceutical ingredients (APIs), particularly for sulfonamide-based drugs.
• Agrochemical Synthesis: Used in the development of new herbicides, fungicides, and insecticides requiring specific sulfonyl moieties.
• Material Science Research: Employed in creating functionalized polymers and advanced materials with specific surface properties.
• Chemical Biology Probes: Acts as a reactive handle for labeling proteins or other biomolecules in probe development.
• Custom Synthesis & Contract Manufacturing: A valuable reagent for custom synthesis houses serving the life sciences sector.
• Academic & Industrial R&D: Fundamental research tool in organic chemistry for exploring new reaction pathways and heterocyclic chemistry.

Basic Information

Product Name	1-Ethyl-3-Methyl-1H-Pyrazole-5-Sulfonyl Chloride
CAS No.	1245820-78-3
Molecular Formula	C6H9ClN2O2S
Molecular Weight	208.67 g/mol
Synonyms	1-Ethyl-3-methyl-1H-pyrazole-5-sulfonyl chloride; 3-Methyl-1-ethyl-1H-pyrazole-5-sulfonyl chloride; 5-Sulfonyl chloride-1-ethyl-3-methylpyrazole; 1H-Pyrazole-5-sulfonyl chloride, 1-ethyl-3-methyl-; Pyrazole sulfonyl chloride derivative; EMPS-Cl; Contact for additional synonyms.
EINECS	Contact for details

Quality Control

Our 1-Ethyl-3-Methyl-1H-Pyrazole-5-Sulfonyl Chloride is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including HPLC, NMR, and IR spectroscopy, to ensure identity, purity, and consistency. We provide comprehensive Certificates of Analysis (COA) with every shipment, detailing all critical quality attributes. Our commitment to reliable supply and traceable documentation supports your R&D and scale-up processes.

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, the container must be kept tightly sealed under an inert atmosphere (e.g., nitrogen or argon) after opening to prevent degradation. Recommended long-term storage temperature is 2-8°C. Keep away from heat, sparks, and open flame.

Specification

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