4-Chloro-2-(thiophen-2-yl)pyrazolo[1,5-a]pyrazine CAS 1255784-69-0

Description

Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including 4-Chloro-2-(thiophen-2-yl)pyrazolo[1,5-a]pyrazine.

4-Chloro-2-(thiophen-2-yl)pyrazolo[1,5-a]pyrazine (CAS 1255784-69-0) is a high-purity analytical reference standard with the molecular formula C10H6ClN3S and a molecular weight of 235.69 g/mol.

The molecular framework of 4-Chloro-2-(thiophen-2-yl)pyrazolo[1,5-a]pyrazine (C10H6ClN3S) is characterized by a nitrogen-containing heterocyclic scaffold, a nitrile group, sulfur-containing functionality, chlorine substitution. In reversed-phase chromatography, its retention is governed primarily by its high hydrophobicity (logP), 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.

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.

The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.

Physical & Chemical Properties

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