2,3-Dihydro-3-oxo-5-isothiazolecarboxylic Acid CAS 1257444-26-0
| CAS No. | 1257444-26-0 |
| Molecular Formula | C4H3NO3S |
| Molecular Weight | 145.14 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.
2,3-Dihydro-3-oxo-5-isothiazolecarboxylic Acid (CAS 1257444-26-0) is a high-purity analytical reference standard with the molecular formula C4H3NO3S and a molecular weight of 145.14 g/mol.
Owing to an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, 2,3-Dihydro-3-oxo-5-isothiazolecarboxylic Acid is typically off-white to pale yellow liquid. Its solid-state physicochemical attributes — including a molecular weight of 145.14 g/mol — guide the selection of appropriate sample preparation and analytical techniques. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
CATO manufactures 2,3-Dihydro-3-oxo-5-isothiazolecarboxylic Acid under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C4H3NO3S |
| Molecular Weight | 145.14 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1990 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Dihydro Standards
- 2-oxo-2,3-dihydro-1,3-thiazole-5-carboxylic acid (CAS 857982-30-0)
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- 2,3-Dihydro-1H-pyrrolo[3,2-b]pyridine-6-carbonitrile (CAS 1194683-74-3)
- 5,6-Dihydro-7,4-(azenometheno)benzofuran (CAS 123292-54-6)
- 1,5-Dihydro-4,7-(azenomethano)pyrrolo[3,4-c]pyridine (CAS 171543-13-8)
- 2,3-Dihydro-1H-pyrrolo[3,4-c]pyridine-6-carbonitrile (CAS 2092731-71-8)
- 6,7-Dihydro-5H-pyrrolo[3,4-b]pyridine-2-carbonitrile (CAS 2091881-44-4)
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Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
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