4-chlorothieno[2,3-d]pyridazine-7-carboxylic acid CAS 1638768-45-2

Description

The occurrence of 4-chlorothieno[2,3-d]pyridazine-7-carboxylic acid is closely related to an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine substitution, an aromatic ring system in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.

4-chlorothieno[2,3-d]pyridazine-7-carboxylic acid (CAS 1638768-45-2), molecular formula C7H3ClN2O2S and molecular weight 214.63 g/mol, is a CATO reference standard with documented purity and traceability.

The molecular framework of 4-chlorothieno[2,3-d]pyridazine-7-carboxylic acid (C7H3ClN2O2S) is characterized by an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine substitution, an aromatic ring system. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.

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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