1-Phenyl-1H-pyrazol-5(4H)-one CAS 876-92-6

Purity >95%In StockPharmaceutical Standards
CAS No.876-92-6
Molecular FormulaC9H8N2O
Molecular Weight160.17 g/mol
CategoryPharmaceutical Standards / API Standards
AvailabilityIn Stock

Chemical Structure

1-Phenyl-1H-pyrazol-5(4H)-one CAS 876-92-6 chemical structure

Description

1-Phenyl-1H-pyrazol-5(4H)-one (CAS 876-92-6) is a high-purity analytical reference standard with the molecular formula C9H8N2O and a molecular weight of 160.17 g/mol.

Owing to a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, 1-Phenyl-1H-pyrazol-5(4H)-one is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 160.17 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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).

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

Molecular FormulaC9H8N2O
Molecular Weight160.17 g/mol
AppearanceOff-white to pale yellow crystalline powder. (faint amine-like odor)
Purity>95%
StorageStore at 2-8°C, protect from light
Solubility (reference)Soluble in DMSO, DMF, methanol
StabilityLight-sensitive; avoid direct strong light
Degree of Unsaturation (DBE)7.0
UV AbsorptionUV-absorbing
Structural FeaturesAromatic ring present
CAS Registry Year (est.)1957
Nitrogen Atoms2

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