1-[1-(4-fluorophenyl)-5-methyl-1h-pyrazol-4-yl]ethan-1-one CAS 5078-58-0

Description

Compared with other compounds in its class, the molecular weight of 218.23 g/mol gives 1-[1-(4-fluorophenyl)-5-methyl-1h-pyrazol-4-yl]ethan-1-one distinctive chromatographic separation conditions and mass-spectrometry parameter settings.

1-[1-(4-fluorophenyl)-5-methyl-1h-pyrazol-4-yl]ethan-1-one (CAS 5078-58-0), molecular formula C12H11FN2O and molecular weight 218.23 g/mol, is a CATO reference standard with documented purity and traceability.

Based on its molecular formula C12H11FN2O, 1-[1-(4-fluorophenyl)-5-methyl-1h-pyrazol-4-yl]ethan-1-one contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, fluorine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 218.23 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. 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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