5-Chloro-1-methyl-1H-pyrazole CAS 42110-76-9

Purity 97%+In StockPharmaceutical Standards
CAS No.42110-76-9
Molecular FormulaC4H5ClN2
Molecular Weight116.55 g/mol
CategoryPharmaceutical Standards / API Standards
AvailabilityIn Stock

Chemical Structure

5-Chloro-1-methyl-1H-pyrazole CAS 42110-76-9 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.

5-Chloro-1-methyl-1H-pyrazole (CAS 42110-76-9), molecular formula C4H5ClN2 and molecular weight 116.55 g/mol, is a CATO reference standard with documented purity and traceability.

5-Chloro-1-methyl-1H-pyrazole (C4H5ClN2) contains a nitrile group, chlorine substitution. Halogen substitution raises its density and boiling point; these physicochemical properties determine the optimal preparation and storage of its standard solutions. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).

CATO manufactures 5-Chloro-1-methyl-1H-pyrazole under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.

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.)1969
Halogen ContentCl-containing
Nitrogen Atoms2

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