5-Hydroxy-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylic acid CAS 21951-33-7

Description

The occurrence of 5-Hydroxy-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylic acid is closely related to a nitrogen-containing heterocyclic scaffold, an amide group, a sulfone group, a hydroxyl group, an ether linkage in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.

5-Hydroxy-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylic acid (CAS 21951-33-7), molecular formula C10H8N2O6S and molecular weight 284.25 g/mol, is a CATO reference standard with documented purity and traceability.

5-Hydroxy-1-(4-sulfophenyl)-1H-pyrazole-3-carboxylic acid (C10H8N2O6S) contains a nitrogen-containing heterocyclic scaffold, an amide group, a sulfone group, a hydroxyl group, an ether linkage. It is notably hygroscopic, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.

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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