3-Methyl-4-(4-nitrobenzoyl)-1-phenyl-1H-pyrazol-5(4H)-one CAS 66755-21-3

Description

Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including 3-Methyl-4-(4-nitrobenzoyl)-1-phenyl-1H-pyrazol-5(4H)-one.

3-Methyl-4-(4-nitrobenzoyl)-1-phenyl-1H-pyrazol-5(4H)-one (CAS 66755-21-3), molecular formula C17H13N3O4 and molecular weight 323.30 g/mol, is a CATO reference standard with documented purity and traceability.

3-Methyl-4-(4-nitrobenzoyl)-1-phenyl-1H-pyrazol-5(4H)-one (C17H13N3O4) contains a flavonoid core, an amide 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.

Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.

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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