4-(2-chloroethyl)-1H-pyrazole CAS 438475-37-7

Purity 97%+In StockPharmaceutical Standards
CAS No.438475-37-7
Molecular FormulaC5H11ClN2
Molecular Weight134.61 g/mol
CategoryPharmaceutical Standards / API Standards
AvailabilityIn Stock

Chemical Structure

4-(2-chloroethyl)-1H-pyrazole CAS 438475-37-7 chemical structure

Description

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.

4-(2-chloroethyl)-1H-pyrazole (CAS 438475-37-7), molecular formula C5H11ClN2 and molecular weight 134.61 g/mol, is a CATO reference standard with documented purity and traceability.

The molecular framework of 4-(2-chloroethyl)-1H-pyrazole (C5H11ClN2) is characterized by chlorine substitution. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.

As a certified reference material (CRM), 4-(2-chloroethyl)-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 FormulaC5H11ClN2
Molecular Weight134.61 g/mol
Purity97%+
StorageStore at 2-8°C, protect from light, keep tightly closed to prevent evaporation
Solubility (reference)Soluble in DMSO, DMF, methanol
StabilityLight-sensitive; avoid direct strong light
Degree of Unsaturation (DBE)1.0
CAS Registry Year (est.)2025
Halogen ContentCl-containing
Nitrogen Atoms2

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