2-Chlorobut-2-enedioic acid CAS 19071-21-7
| CAS No. | 19071-21-7 |
| Molecular Formula | C4H3ClO4 |
| Molecular Weight | 150.52 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
2-Chlorobut-2-enedioic acid (CAS 19071-21-7) is a high-purity analytical reference standard with the molecular formula C4H3ClO4 and a molecular weight of 150.52 g/mol.
Owing to a carbohydrate-derived structure, chlorine substitution, 2-Chlorobut-2-enedioic acid is typically white to off-white crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 150.52 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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).
As a certified reference material (CRM), 2-Chlorobut-2-enedioic acid meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C4H3ClO4 |
| Molecular Weight | 150.52 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, keep sealed and dry, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| Stability | May oxidize slowly on prolonged air exposure; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1962 |
| Halogen Content | Cl-containing |
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