(R)-5-Chloro-8-methoxy-3-methyl-1-oxo-3,4-dihydro-1H-isochromene-7-carboxylic Acid CAS 1421840-16-5

Purity 97%+In StockPharmaceutical Standards
CAS No.1421840-16-5
Molecular FormulaC12H11ClO5
Molecular Weight270.67 g/mol
CategoryPharmaceutical Standards / API Standards
AvailabilityIn Stock

Chemical Structure

(R)-5-Chloro-8-methoxy-3-methyl-1-oxo-3,4-dihydro-1H-isochromene-7-carboxylic Acid CAS 1421840-16-5 chemical structure

Description

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

CATO supplies (R)-5-Chloro-8-methoxy-3-methyl-1-oxo-3,4-dihydro-1H-isochromene-7-carboxylic Acid (CAS 1421840-16-5), a certified reference material (molecular formula C12H11ClO5, MW 270.67 g/mol) for analytical method development and quality control.

(R)-5-Chloro-8-methoxy-3-methyl-1-oxo-3,4-dihydro-1H-isochromene-7-carboxylic Acid (C12H11ClO5) contains a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine substitution, an aromatic ring system. It is notably hygroscopic, halogen substitution raises its density and boiling point, 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).

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 FormulaC12H11ClO5
Molecular Weight270.67 g/mol
AppearanceOff-white to pale yellow crystalline powder. (slight halide-like odor)
Purity97%+
StorageStore at 2-8°C, protect from light, keep sealed and dry, keep tightly closed to prevent evaporation
Solubility (reference)Soluble in methanol, acetonitrile, DMSO, water (slightly soluble)
StabilityMay oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions
Degree of Unsaturation (DBE)7.0
UV AbsorptionUV-absorbing
Structural FeaturesAromatic ring present
CAS Registry Year (est.)1991
Halogen ContentCl-containing

Related R Standards

Recommended Standards

Why CATO?