2-Oxo-2H-pyran-3-carboxylic acid CAS 3040-20-8

Purity 97%+In StockPharmaceutical Standards
CAS No.3040-20-8
Molecular FormulaC6H4O4
Molecular Weight140.09 g/mol
CategoryPharmaceutical Standards / API Standards
AvailabilityIn Stock

Chemical Structure

2-Oxo-2H-pyran-3-carboxylic acid CAS 3040-20-8 chemical structure

Description

2-Oxo-2H-pyran-3-carboxylic acid (CAS 3040-20-8), molecular formula C6H4O4 and molecular weight 140.09 g/mol, is a CATO reference standard with documented purity and traceability.

2-Oxo-2H-pyran-3-carboxylic acid (C6H4O4) contains a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system. It is notably hygroscopic, the carboxyl group imparts weak acidity; 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).

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

Molecular FormulaC6H4O4
Molecular Weight140.09 g/mol
Purity97%+
StorageStore at 2-8°C, keep sealed and dry
Solubility (reference)Soluble in methanol, ethanol, DMSO, water
StabilityMay oxidize slowly on prolonged air exposure; Hygroscopic; reseal immediately after opening
Degree of Unsaturation (DBE)5.0
UV AbsorptionUV-absorbing
Structural FeaturesAromatic ring present
CAS Registry Year (est.)1957

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