Ethyl 4-(3-(4-chlorophenyl)benzo[c]isoxazole-5-carbonyl)isoxazole-3-carboxylate CAS 337920-31-7

Description

Owing to a flavonoid core, an amide group, a hydroxyl group, an ether linkage, chlorine substitution, Ethyl 4-(3-(4-chlorophenyl)benzo[c]isoxazole-5-carbonyl)isoxazole-3-carboxylate is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 396.78 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).

Ethyl 4-(3-(4-chlorophenyl)benzo[c]isoxazole-5-carbonyl)isoxazole-3-carboxylate (CAS 337920-31-7), molecular formula C20H13ClN2O5 and molecular weight 396.78 g/mol, is a CATO reference standard with documented purity and traceability.

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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