3-Chloro-4-methyl-1H-pyrazole CAS 134589-56-3

Purity 97%+In StockPharmaceutical Standards
CAS No.134589-56-3
Molecular FormulaC4H5ClN2
Molecular Weight116.55 g/mol
CategoryPharmaceutical Standards / API Standards
AvailabilityIn Stock

Chemical Structure

3-Chloro-4-methyl-1H-pyrazole CAS 134589-56-3 chemical structure

Description

Based on its molecular formula C4H5ClN2, 3-Chloro-4-methyl-1H-pyrazole contains a nitrile group, chlorine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 116.55 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.

3-Chloro-4-methyl-1H-pyrazole (CAS 134589-56-3) is a high-purity analytical reference standard with the molecular formula C4H5ClN2 and a molecular weight of 116.55 g/mol.

This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.

As a certified reference material (CRM), 3-Chloro-4-methyl-1H-pyrazole meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.

Physical & Chemical Properties

Molecular FormulaC4H5ClN2
Molecular Weight116.55 g/mol
Purity97%+
StorageStore at 2-8°C, protect from light, keep tightly closed to prevent evaporation
Solubility (reference)Soluble in DMSO, DMF, methanol
StabilityMay oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light
Degree of Unsaturation (DBE)3.0
UV AbsorptionUV-absorbing
CAS Registry Year (est.)1995
Halogen ContentCl-containing
Nitrogen Atoms2

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